ClipMenu can manage clipboard history. You can record 8 clipboard types, from plain text to image. To paste a recorded item, you just pop up menu by invoking the shortcut key, and select a menu item from the menu. You can also register texts you frequently use, like e-mail addresses, user IDs and so on, as snippets. You can paste these snippets from the menu, too.

Requirements:
OS X 10.5-10.6
Universal Binary