Scientists:
A pet peeve I have is that wikipedia has hordes of monstrously long articles on actors, reality TV stars, musicians and other celebrities that deal with the most tedious and non-notable (in a colloquial, not WP:Notability sense) facts, while articles about scientists are so often stub, start, or C-class articles. I find scientist bios especially lacking insofar as discussing the actual scientific work of the subject. I'm currently working on remedying this problem in the articles for:
Lawrence Krauss
Patricia Smith Churchland
And plan on continuing with this work in these articles:
David Sloan Wilson
Robert Trivers
Steven Pinker
Scott Atran
Paul Churchland
Adrian Raine
(And yes I know the Churchlands are really philosophers.) I plan to get to work on these as time allows, all the time remaining carefully aware of the WP:WEIGHT guidelines. I'd love help.