I've just started working on my 2nd job out of university and my new employer has offered to pay for the resources and the tests to get me some certifications.
Although most of the companies software is written in Java I'm pretty much the only .Net developer and they mean to keep me as a .Net devloper.
I've looked into getting .Net 3.5 certification but it looks like most of the books for it are as yet unavailable. I've skimmed through the .Net fundamentals book, and it's okay but it's not very well written and there are apparently some errors in the code.
So far my best resource has been this post by Jorgen Thelin: http://www.thearchitect.co.uk/weblog/archives/2008/08/path_to_net_35_developer_certification.html
but it looks like the books he recommends aren't in print yet :(