The dangerous thing about learning more about something is that you usually learn that you don't really know anything about it at all.  Here's a great pair of blog entries talking about interview questions which MIGHT be asked of prospective developers in general and .Net developers in particular.  Now, I've been a professional developer (ok - amateur masquerading as a pro) for nearly six years and I can't answer a lot of these questions.  Like I said, I've got a lot to learn:

Chris Sells posted some "fun" interview questions - http://www.sellsbrothers.com/fun/msiview/.  Actually, this page is a bunch of links to interview sites, but the bottom of the page has a link to the questions - divided into 4 categories.  Great stuff that brings you back to your early CS classes (implement a linked list...)

Scott Hanselman has posted some interview questions divided into experience levels - if you're a guru you should be able to answer everything where entry level should be good with the top set.  There are also some targeted questions for ASP.Net and XML developers.  Check Scott Hanselman's post (and a previous post about ASP.Net questions) out at http://www.hanselman.com/blog/WhatAGreatNETDevelopersOughtToKnowMoreNETInterviewQuestions.aspx

Thanks guys, for reminding me that I need to spend more time with my nose in books!

-- Matt Ranlett