I've been wrestling with MVC today.

I recently installed the RC after working with preview version for a while for some reason lots of my most favorite extended methods were gone after this installation.

So far I've tried re-installing the MVC RC package, overriding the dll manually, removing all the other assemblies from the web.config - leaving system.web.mvc the only one and nothing helped.

Oddly enough the object explorer show the ActionLink method on system.web.mvc.dll (namespace: system.web.mvc.html class:LinkExtensions) But all the insallisence give is a a short list that that seem to come from HtmlHelper but not those I need:

After playing with it a little - trying different assemblies I've found that the Extensions were moved to 'system.web.mvc.html', and the reason it didn't work was becouse the GAC was still holding an old version of that assembly (Preview 5)