Hi Gerard

>I'd be interested in getting feedback from anybody who has used any of the
>dot net frameworks. I am awate of MM and Strataframe but perhaps there are others.
>
>Any feedback at all in terms of ease of use, learning curve, scalability etc would be much appreciated
>

I suggest you look at www.DotNetNuke.Com

This is a VB.Net and ASP.Net open source "framework" for building websites and websystems (web-based systems).