This is Rumor Mill worthy, but DigitalBits and TVShowsOnDVD are reporting that Season 2 of the Sarah Connor Chronicles will hit DVD and Blu-Ray sometime in Q3. TVShows seems to think it'll be August.
It'll probably be out around the first week of September (if they get a season three - which is possible because of WB's funneling funds into the show).
This isn't really thread worthy without concrete info, August and September is the standard release window for shows that run a typical network TV season.