It was bound to happen. The very day I fly off on vacation is the day that Microsoft posts the first public CTP of StreamInsight. This is CTP2. CTP1 was for private distribution inside Microsoft only, and I couldn't convince or bribe anyone to slip me a copy. So, I just noticed now, and I haven't had a chance to look at it yet. Can't wait, though.
CTP2 can be downloaded from http://www.microsoft.com/downloads/details.aspx?FamilyID=a3faa562-b6dc-4702-90c6-bf8e08df3b8b&displaylang=en