While working with Pavan Peddada on documenting our As-Is software architecture, he uncovered the blog of Tony Sneed.  He covers some really good topics in his blog.  Two posts jumped out at me right off the bat:

Interviews (it has a good simple list of C# questions)

http://blog.tonysneed.com/2012/02/28/screening-c-candidates-lets-play-20-questions/

Onion Architecture (it has a good reference implementation)

http://blog.tonysneed.com/2011/10/08/peeling-back-the-onion-architecture/