As a keyboardy person who thinks in plain text, Jumpcut is my clipboard history manager of choice on the Mac. If you’re more of mouser and visual thinker, Corkboard is well worth a look.
The app automatically saves everything you copy—nicely handling different filetypes, from URLs to images via vCards—and lets you search your clipboard history.
It can work like a real-life corkboard, too, letting you actively add something via drag ‘n’ drop, optionally ‘locking’ it in place on the board (handy if you’re working on an illustrated blog post, say).
Via Appstorm.