diff --git a/PBGitSidebarController.m b/PBGitSidebarController.m
index 8f325ac..e8ca450 100644
--- a/PBGitSidebarController.m
+++ b/PBGitSidebarController.m
@@ -9,6 +9,12 @@
 #import "PBGitSidebarController.h"
 #import "PBSourceViewItem.h"
 
+@interface PBGitSidebarController ()
+
+- (void)populateList;
+
+@end
+
 @implementation PBGitSidebarController
 @synthesize items;
 
@@ -17,13 +23,114 @@
 	self = [super initWithRepository:theRepository superController:controller];
 	[sourceView setDelegate:self];
 	items = [NSMutableArray array];
+
 	return self;
 }
 
 - (void)awakeFromNib
 {
-	window.contentView = self.view;
 	[super awakeFromNib];
+	window.contentView = self.view;
+	[self populateList];
+}
+
+#pragma mark NSOutlineView delegate methods
+- (BOOL)outlineView:(NSOutlineView *)outlineView isGroupItem:(id)item
+{
+	return [item isGroupItem];
+}
+
+- (void)outlineView:(NSOutlineView *)outlineView willDisplayCell:(id)cell forTableColumn:(NSTableColumn *)tableColumn item:(id)item
+{
+	if ([item isGroupItem])
+		[cell setImage:nil];
+	else
+		[cell setImage:[NSImage imageNamed:@"new_file"]];
+}
+
+- (BOOL)outlineView:(NSOutlineView *)outlineView shouldSelectItem:(id)item
+{
+	return ![item isGroupItem];
+}
+
+//
+// The next two methods are necessary to hide the triangle for uncollapsible items
+// That is, items which should always be displayed, such as the action items.
+//
+- (BOOL)outlineView:(NSOutlineView *)outlineView shouldCollapseItem:(id)item
+{
+	return !([item isUncollapsible]);
+}
+
+- (void)outlineView:(NSOutlineView *)outlineView willDisplayOutlineCell:(id)cell forTableColumn:(NSTableColumn *)tableColumn item:(id)item
+{
+	[cell setTransparent:[item isUncollapsible]];
+} 
+
+- (void)populateList
+{
+	PBSourceViewItem *actions = [PBSourceViewItem groupItemWithTitle:@"Actions"];
+
+	PBSourceViewItem *branches = [PBSourceViewItem groupItemWithTitle:@"Branches"];
+	PBSourceViewItem *remotes = [PBSourceViewItem groupItemWithTitle:@"Remotes"];
+	PBSourceViewItem *tags = [PBSourceViewItem groupItemWithTitle:@"Tags"];
+	PBSourceViewItem *custom = [PBSourceViewItem groupItemWithTitle:@"Custom"];
+
+	for (PBGitRevSpecifier *rev in repository.branches)
+	{
+		if (![rev isSimpleRef])
+			[custom addChild:[PBSourceViewItem itemWithRevSpec:rev]];
+		else if ([[rev simpleRef] hasPrefix:@"refs/heads/"])
+			[branches addChild:[PBSourceViewItem itemWithRevSpec:rev]];
+		else if ([[rev simpleRef] hasPrefix:@"refs/tags/"])
+			[tags addChild:[PBSourceViewItem itemWithRevSpec:rev]];
+		else if ([[rev simpleRef] hasPrefix:@"refs/remotes/"])
+			[remotes addChild:[PBSourceViewItem itemWithRevSpec:rev]];
+		
+	}
+
+	[items addObject:actions];
+
+	[items addObject:branches];
+	[items addObject:remotes];
+	[items addObject:tags];
+	[items addObject:custom];
+
+	[sourceView reloadData];
+	[sourceView expandItem:branches expandChildren:YES];
+	[sourceView expandItem:actions];
+
+	NSAssert(actions == [sourceView itemAtRow:0], @"First item is not the Action");
+	[sourceView reloadItem:nil reloadChildren:YES];
+
+}
+
+#pragma mark NSOutlineView Datasource methods
+
+- (id)outlineView:(NSOutlineView *)outlineView child:(NSInteger)index ofItem:(id)item
+{
+	if (!item)
+		return [items objectAtIndex:index];
+
+	return [[(PBSourceViewItem *)item children] objectAtIndex:index];
+}
+
+- (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item
+{
+	return [[(PBSourceViewItem *)item children] count];
+}
+
+- (NSInteger)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item
+{
+	if (!item)
+		return [items count];
+
+	return [[(PBSourceViewItem *)item children] count];
+}
+
+- (id)outlineView:(NSOutlineView *)outlineView objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)item
+{
+	return [(PBSourceViewItem *)item title];
 }
 
 @end
diff --git a/PBSourceViewItem.h b/PBSourceViewItem.h
index 3b722c7..5825bc8 100644
--- a/PBSourceViewItem.h
+++ b/PBSourceViewItem.h
@@ -8,13 +8,25 @@
 
 #import <Cocoa/Cocoa.h>
 
+@class PBGitRevSpecifier;
 
 @interface PBSourceViewItem : NSObject {
-	NSString *name;
+	NSMutableArray *children;
+
+	NSString *title;
+	PBGitRevSpecifier *revSpecifier;
+
+	BOOL isGroupItem;
 }
 
-- (id)initWithName:(NSString *)name;
++ (PBSourceViewItem *)groupItemWithTitle:(NSString *)title;
++ (PBSourceViewItem *)itemWithRevSpec:(PBGitRevSpecifier *)revSpecifier;
+
+- (void)addChild:(PBSourceViewItem *)child;
+
+@property(retain) NSString *title;
+@property(readonly) NSMutableArray *children;
+@property(assign) BOOL isGroupItem;
+@property(retain) PBGitRevSpecifier *revSpecifier;
 
-@property(retain) NSString *name;
-@property(readonly) NSArray *children;
 @end
diff --git a/PBSourceViewItem.m b/PBSourceViewItem.m
index 8629a50..dfbd7de 100644
--- a/PBSourceViewItem.m
+++ b/PBSourceViewItem.m
@@ -7,23 +7,47 @@
 //
 
 #import "PBSourceViewItem.h"
-
+#import "PBGitRevSpecifier.h"
 
 @implementation PBSourceViewItem
-@synthesize name;
-@dynamic children;
+@synthesize title, isGroupItem, children, revSpecifier;
 
-- (id)initWithName:(NSString *)aName
+- (id)init
 {
 	if (!(self = [super init]))
 		return nil;
 
-	name = aName;
+	children = [NSMutableArray array];
 	return self;
 }
 
-- (NSArray *)children
++ (PBSourceViewItem *)groupItemWithTitle:(NSString *)title
 {
-	return [NSArray array];
+	PBSourceViewItem *item = [[PBSourceViewItem alloc] init];
+	item.title = title;
+	item.isGroupItem = YES;
+	return item;
 }
+
++ (PBSourceViewItem *)itemWithRevSpec:(PBGitRevSpecifier *)revSpecifier
+{
+	PBSourceViewItem *item = [[PBSourceViewItem alloc] init];
+	item.revSpecifier = revSpecifier;
+
+	return item;	
+}
+
+- (void)addChild:(PBSourceViewItem *)child
+{
+	[self.children addObject:child];
+}
+
+- (NSString *)title
+{
+	if (title)
+		return title;
+	
+	return [revSpecifier description];
+}
+
 @end