Scott Gu just posted on his blog about the new features that Service Pack 1 for Visual Studio 2008 will bring to Visual Web Developer Express Edition. ASP.NET MVC will be supported on VWD Express but what I find more exciting is the ability to create class libraries(.dll) projects in VWD. I have always seen that as the biggest drawback of the Express Edition. I hope VWD will be able to open solutions that contain class library projects created in higher editions of Visual Studio. Right now it loads only the web projects. You can read the original post
here.
Update: Scott just confirmed in the comments on his blog that VWD Express will open solutions containing class libraries created in other editions of Visual Studio. I guess that makes VWD Express full featured IDE as long as you are a lone developer.