I had blogged previously that the metadata browser had been removed from CRM 2011, I don’t really understand why you would remove this functionality but if you want to read about that you can here
Clearly Rhett Clinton at the excellent MSCRM Bing’d blog was also missing this feature. So Rhett being a CRM a great contributor to the CRM community went and build a Metadata browser in silverlight, awesome.
Find out more about it here
you can also find the project on codeplex on the link below
find out more about that here
Awesome work from Rhett, his blog is also a good source of information and interesting articles.