Blake Handler of The Road To Know Where has compiled an awesome list of free goodies from Microsoft. I haven't tried all but I did like the Vista-like Alt-Tab plugin. It shows a thumbnail of the application while alt-tabbing. I also saw some potentially interesting tools that I'm going to try out soon.
I’ve written many posts about the strengths and weaknesses of Event Sourcing, but I still thought it might be useful to provide you with a list of the most important practical guidelines and heuristics that I think are needed to be successful with Event Sourcing