We have a newsgroup that has been specifically opened for System.Net questions for Whidbey Beta2 of the framework. Though its for 2.0, I am seeing people post questions on v1.1 and 1.0. I highly encourage people to post questions/issues there as its being monitored by all PM's and by some SDE and SDET's (even those who dont blog). Posting on this newsgroup will guarantee the fastest response time as opposed to a blog or email.
Location of newsgroup is http://forums.microsoft.com/msdn/ShowForum.aspx?ForumID=40
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