I haven't done that much programming in Cocoa since Leopard came out so I haven't really spent that much time with Xcode 3. However I'm trying to learn a bit of network programming and I'm sure the debugger in the new Xcode is completely broken. I don't know whether it's trying to reflect lazy initialisation of objects or whether it just doesn't know where it's going, but stepping through code makes no sense what so ever. Then it shows an exception three lines (and as many complex method calls) before it actually happens, leading me to spend half an hour trying to work out why my code was crashing when adding an object to an array.

I do like the new pretty colours though.