Very beautiful, but I think the future is actually something like http://ideone.com. I'd also like to be able to manually set the language for syntax highlighting purposes. I have to give these guys major props on the simplicity/prettiness of the UI and providing keyboard shortcuts for everything (even for twitter!).
EDIT: Oh, and like some other commenters I liked how the URLs are made of consonant-vowel pairs, so as to make them pronounceable. Very cool touch!
EDIT2: I promise to not edit this further, but I'd also like to congratulate them on the sane colorscheme. Very easy on the eyes, espec. compared to something like pastebin.com