<p>Has anybody got any real world stories build mobile web sites with NetBiscuits?</p>

<p>Someone told me it was the next big thing in mobile development (<a href="http://www.netbiscuits.com/home" rel="nofollow noreferrer">http://www.netbiscuits.com/home</a>) and it looks pretty good from their site. Just wondered if anybody (besides them) has actually used it.</p>

You can start msbuild from the command line. msbuild understands .sln (solution) files. You can specify the .sln file and the build configuration (debug, release etc.) from the command line.
http://msdn.microsoft.com/en-us/library/ms164311.aspx
Here is the documentation on what you can do with msbuild. MSBuild.exe is installed with the .net framework, not with visual studio. You can find it in c:\windows\microsoft.net\framework\v3.5 (or v2.0.50727)
I searched a bit and found that you can also do a command line build with visual studio using devenv.exe /build, more info here:
http://msdn.microsoft.com/en-us/library/xee0c8y7(VS.80).aspx