Servers aren’t cheap, so we’d like to take a moment to thank the advertisers on DCist this week: Zipcar for letting those of us who don’t have cars where we can rent them from without going to an airport. Bookfest 2007 at the Library of Congress because books are important and festivals for books are even more important. Busted Tees for making us feel like our T-shirt collection isn’t quite funny enough. Strong American Schools…