parrotfish has links to the various companion drabbleathons and
a hilarious Jack-Brigadier drabble. Major, major drinks warning.
box_in_the_box has a post about Batman characters, but I link it because
the first cartoon seems to be how every show (especially Buffy and Torchwood!) is treating sexuality these days. (See also Shakespeare: Two Noble Kinsmen.) Not entirely worksafe.
Fearless Editor has the lineup of Doctors and companions in The Qualities of Leadership. And to think I didn't pitch a Four-Sarah Jane story because I thought everybody else would!