Jumpcut allows me to copy multiple items from one document. switch to another document and paste in each of the copied items. If not for Jumpcut I'd have to switch back to the original document after each paste: this is so much easier.

@ohwhateverblah: I love the text backup idea; thanks!

if you already use quicksilver this is unnecessary as quicksilver can do this for you:

http://theappleblog.com/2006/10/24/quicksilver-screencast-the-clipboard/

I use it as a quick backup for my text. If I need to note something or just make sure my forum post won't disappear, etc., I just copy it and later find it in the menu.

Butler gives access to clipboard history without adding any icon in the menu bar, plus it is highly configurable, very well designed, and can do many other useful things. :)

Beside Quicksilver this is my most frequently used app. I can't work without it. Anyhow it only handles text entries. This is all I need. My productivity on Terminal is boosted by this tiny little friend.

Useful indeed, but it just handles text.
It would be nice if it could handle pictures too.
Maybe in a future version...

this is oh so helpful. i am a horribly sloppy coder, and this little app helps so much with trial and error when i am putting together some java or javascript in textwrangler or editing some redundant css. furthermore i have never been a fan of transparent windows or "pop-up helpers", but have found myself growing quite fond of that sticky bezel, my hot-key for it is "command-shift-.". what a nice piece of software.

This has saved my neck a number of times.

I'd struggle to live without this little app now. It saves so much time when you need to copy and paste chunks of code across multiple documents. And as bifter says above, once you get used to using Jumpcut's keyboard shortcut, it just seems like a logic part of the OS.

Once you have this figured out there is no turning back to a cut n paste with a memory of only one. Excellent app that I use all the time - in fact I have set it to boot when my mac starts. It seems to run as part of the operating system.