GUI diff tools

The Developer Tools for Mac OS come with Filemerge, which is a nice enough application for being able to compare files. I have also used DiffMerge in the past, though I wish it would get updated. In fact, I wish it would get updated to look like [Kaleidoscope](http://www.kaleidoscopeapp.com/), which I tried and liked but at $39, I am not sure I am ready to buy. The nice thing about Kaleidoscope is that it can also handle images — I’m not quite sure how I would use it, but like any good geek I like the idea of having “more power” than I know what to do with.