The SBS Exchange SP1 QFE is now online and available at http://www.microsoft.com/downloads/details.aspx?FamilyID=0fe89c95-e767-428c-8621-6a586c655ee3&DisplayLang=en (and is now available in all 18 languages - sorry for the delay in that).
The other big update that is in the pipeline is our XP SP2 compatibility fix. This is in testing right now - we're investigating making this update available through Windows Update so all SBS 2003 customers become aware of it. Our plan is to make it available same day (or earlier) than XP SP2 becomes available. The main thing this will do is modify the group policy on the server to allow the ICF firewall on XP and 2000 clients, and to pre-set certain exceptions on clients through group policy.
Otherwise, I haven't got much news to report