Jeans and tshirts (Threadless, Woot, Target, various nerd/game themes throughout). Hot as hell at the moment, though, so shorts are the weapon of choice. Tend to be pattern/print shorts or the "quilt/collage" things (where it's a bunch of small squares of various fabrics).
Laceless navy blue cons. Sometimes a cuff watch.
Hate polos, hate khakis, hate button up shirts/anything formal.