I like Google Desktop Search. It's lightning fast, and I like the idea and implementation. I think it will really get better once they release an API. For some reason, I never really latched on to IndexServer. I'm not sure why, it just seems too cumbersome or something. I like the concept of IndexServer, but I always end up using grep instead. Maybe it's just that Old Habits Die Hard.

But with GDS, I find myself using it more for some reason. However, as a Delphi or C# developer, you probably aren't deriving much benefit from this version of the GDS beta since pas and cs files are not indexed. Lord CRC (sorry, don't know his actual name) solved that problem by hacking the EXE to change the file extensions that are indexed. He also puts in some information on what you can do to fix this yourself if you're uncomfortable with using his hacked EXE. You can download the hack here.