One of the nicest things about Android that gets taken for granted is the ability to customize your user interface. While most folks tend to stick to app icons for launching their apps, Tagy offers an alternative approach: a tag cloud. Tagy is actually a set of widgets that let you specify a list of apps, contacts, or bookmarks to appear in a single widget. Then, as you use the widget, the items you use more often will get bigger.
Users can customize the color of their tags to fit into whatever theme they're already using. Additionally, because the items you use get larger the more you use them, you can isolate the less-used apps, which you can then either remove from the list or uninstall altogether.