If you spend a lot of time coding or writing, then you've bumped into the need for having access to more than one item in the clipboard. I used to have a text file open just for cutting and pasting snippets of text. Then I tried selecting text and dropping it on my desktop to create little clippings I could repaste into my document just by dragging and dropping. But both of those methods required moving windows around. With expose or multiple desktops that became easier, but it was still a lot of work. Then I discovered iClip3. What a gift from heaven. Now I could easily cut items to my hearts content and recall them all without moving any windows around. The few months I spent on my new Macintel Mini last Fall were torture because iClip 3 wasn't available as a Universal Binary.
Fortunately, that is all in the past now. With a slick new update to the UI, and now as a Universal Binary file, iClip 4 is stable on both my G4 and my Macintel and I couldn't be happier. As with earlier versions, iClip 4 has a bank of cells that can be filled with clips automatically as you go about your business, or you can select some cells to be manually filled with clippings for future reference. Holding your mouse over a cell displays a nicely rendered representation of your text, image, url, or data in a popup window. Then with a simple click of a mouse iClip slides away. I find it indispensable and highly recommend it to all Mac users.
Also recommended is iClip Lite, the clipboard widget. It's free and very handy. I use iClip Lite to keep my permanent clippings and let iClip 4 handle all the automatic clipboard recording. Using both this way saves me so much time. Give it a try.