Lots going on for ISV's with Microsoft support.  If you're an ISV and want to get support, one easy way to get started is by browsing the ISV Partner web site.

http://members.microsoft.com/partner/isv/

From here, you get to see links to webcasts, new programs, strategies, and other resources.  Some cool links for technical help from this site are:

Longhorn Readiness Program for ISVs
http://members.microsoft.com/partner/isv/longhorn.aspx

Windows Server Developer Program
http://members.microsoft.com/partner/isv/windowsserver2003/default.aspx

Smart Client Readiness for ISVs
http://members.microsoft.com/partner/isv/smartclients/default.aspx

And the on-ramp program for new ISV's, called Empower
http://members.microsoft.com/partner/isv/empower/default.aspx