PowerCommands Cause Visual Studio 2008 SP1 Crash
I was badly surprised today, when Visual Studio 2008 SP1 suddenly quit while loading the "Choose Toolbox Items" dialog. After some Googling I learnt that such things were caused by PowerCommands, thanks to the guys here. However, the workaround is pretty simply, you just have to re-install PowerCommands. After that procedure Visual Studio starts working properly again.