Today Ian Baird of Skorpiostech has released an awesome comparison tool, Changes. Besides doing text diffs you can also do directory diffs and see what files are new, removed, or changed. It features great integration with TextMate, BBEdit and Xcode. There is also a wiki with tips for SCM integration. The addition of a great command line utility chdiff is a boon to us developers too. I loved it so much I bought a license before the beta was over. ((I even contributed to the wiki where there was an offer of free licenses, but I turned that down, choosing instead to support an indie dev with my dollars.)) Now if only I had Leopard (required) at work to use it there. Some day.