Jason Zander wants you to tell MS directly:

"It's been just over 6 months since we launched Visual Studio 2010 in April. I hope you've been busy digging in and taking VS out for a spin. Your feedback was invaluable to us as we were building VS - thank you! It's a great time for us to hear what you think so far. We are especially interested in hearing about your experience with regards to performance, reliability, and quality. The more details you share with us in this survey, the better we can understand your experience and apply what we learn into future versions."

Jason Zander's blog post