I am a long time IDEA user but recently I thought I would have a quick look at eclipse. One of the things that I find extremely useful is the way eclipse highlights errors in the source tree. If a file has an error in it, then its entry in the source tree has a little red cross in the corner of the icon. What is more, its owning package gets a red cross and ultimately the root package also. Would anyone else find this useful? I dont think this would take a lot of effort to implement (:-\) but would be very useful.