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.
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 ISVshttp://members.microsoft.com/partner/isv/longhorn.aspx
Windows Server Developer Programhttp://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 Empowerhttp://members.microsoft.com/partner/isv/empower/default.aspx