Welcome back to my 30 Doctor Who Challenge
Day 20: A Who Related Fan-Site
My choice is going to be http://www.kaldorcity.com/
A great resource for academic quality examination of various areas of Doctor Who, including an episode by episode overview of the 2005 series, plus the highly entertaining 50 Things articles.
Of course there is plenty of material about the spin off Audio play series Kaldor City which stars Paul Darrow, Russell Hunter and Scott Fredericks.