I'm obviously very new to AJAX (just installed it yesterday).  But it seems I'm supposed to have a bin folder with a whole bunch of dlls in it but I don't.  I've installed all the required files (the ajax extensions, the futures ctp file and the ajax control toolkit and VS 2005 sp1) as far as I know.  What am I missing?  Ultimately I'm trying to get a tab control to work, but I'm getting all sorts of errors.  ie.  unknown element errors, unregistered prefix tag etc...

I think I've done something seriously wrong. 

In AJAX RTM, the AJAX assemblies are installed in the Global Assembly Cache (GAC) like ASP.NET itself is. In turn, those assemblies need to be registered in your web.config file so the runtime knows where to locate those assemblies. Make sure the assemblies are correctly registered in the web.config. The web.config file in the AJAX Project Type has all of them already defined in it.