iSnip is the easiest way to manage and access your text snippets. iSnip lives in the menu bar, right next to the Time, Volume, and similar menus. From the iSnip menu, you have easy access to any of your text clippings. There's a Snippet Manager window that allows you to organize and modify your snippets with ease. Once you're done, just go to the menu, select a snippet, and it's inserted directly into the frontmost application or copied to the clipboard!
iSnip also allows you to have multiple clipboard at the same time.