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Yeah, the ad-ridden part bothers me the most. I immediately closed the window once I saw the page plastered with ads without even trying it out to see if it was any good. That's just not something I'd ever want to use.

Adblock does a good job of removing ads here:

http://i.imgur.com/YO7bt.png

A tool like this isn't the place for an ad-supported model. This is a place to work with text, and the colorful, animated, image-based ads are simply too distracting to do any real work for more than a minute or two.

This also handles the tab key properly whereas codepad (currently) does not.

Wow, I haven't tried either but not using the tab key in a code editer is kind of silly.

Beside API, after registration at Ideone you can tag your codes (quite flexible, I guess), switch off ads + some more features.