The Beta 2 of VS 2008 is great, apart from one pretty major issue: on occasion it seems to hang for several minutes. This hanging behavior seems especially prevalent when entering and exiting a debug session...which frankly makes debugging pretty much unusable. This might be something to do with my particular system (it's a hokey Vista pre-Beta upgrade to RTM...Search doesn't work on it at all) but 2005 hasn't got this issue...
Of course the real bugger is I forgot to save a backup when I upgraded this particular solution, rendering it unusable in 2005...hmm...