Microsoft is infamous when it comes to their interviewing.  Here are a few helpful tips if you even find yourself in this precarious position!

http://weblogs.asp.net/JobsBlog/

http://www.sellsbrothers.com/fun/msiview/

http://halcyon.usc.edu/~kiran/msqs.html

http://www.techinterview.org

http://www.ocf.berkeley.edu/~wwu/riddles/intro.shtml

http://www.4guysfromrolla.com/misc/100798-1.shtml

http://www.acetheinterview.com/qanda/microsoft_interview.html

http://www.techinterviews.com/index.php?p=46

 And of course the essential book:

How would you move Mount Fuji