The web.config now supports intellisense but they changed how it worked between Beta 2 and the release. Previously in beta 2, it was required to put a namespace specifying where to get the schema for the intellisense. They removed this requirement, so now IntelliSense will not work if a namespace is specified. The bad time is that the ASP.NET Web Administration tool always inserts this back in (bug). So basically, if IntelliSense is not working, do the following. Change:
<configuration
xmlns=" http://schemas.microsoft.com/.NetConfiguration/v2.0">
to:
<configuration>
Read the complete post at http://www.dotnettipoftheday.com/blog.aspx?id=8