Microsoft Expression is the successor to Microsoft Frontpage. In addition to being able to create fully html 4.01 compliant websites, it is capable of supporting ASP.NET 2.0 from the ground up! Other features include full CSS 1.0/2.0/2.1 support and it also generates Section 508 compliant code.
Bitstop is planning on giving a demo/preview of how easy Microsoft Expression can be used to create database driven, CSS, ASP.net 2.0 websites in the coming weeks. Watch this space for further announcements.