Let's get some dialog going here. I'll start. When searching for juried shows and other artistic opportunities, there are two major sources I always check - Art Calendar Magazine and artshow.com.
Art Calendar Magazine
I started subscribing to this magazine about three years ago, and find it remarkably resourceful for all kinds of art related information from copyright laws for your artwork to articles on how to correctly package your work for shipping (http://www.artcalendar.com/article.asp?ID=123). However, I typically instantly flip to the back of the magazine to scour the extensive "call for art" listings. Not only do they provide a great resource to artists, but they also allow shows/calls for art that don't require an entry fee to advertise for free on both their web site and in the magazine. It is very artist friendly.
GREAT resource! From artists, their work, art classes and tips to competitions and art shows - this site is here to help you succeed!
Ok - your turn - let us know where you look for listings and other artsy info!