I am about to reenter the MFC world after years away for a new job. What resources to people recommend for refreshing the memory? I have been doing mainly C# recently.
Also any MFC centric websites or blogs that people recommend?

I would highly recommend my all-time favorite book: MFC Internals: Inside the Microsoft© Foundation Class Architecture
It is not a 'how-to' book — it is a 'how does it work' book.
The vital "how do I?" book is http://www.amazon.com/gp/reader/0201185377/ref=sib_dp_pt#reader-link
Codeproject is also invaluable, although many of the 3rd party controls there nowhave counterparts in the new MFC feature pack.
Books are one thing, but I always found that practice was the key with MFC. CodeGuru was my favourite destination to answer anything MFC-related.
There's also that new website. What's it called...that's it - StackOverflow!