You can now play those official StarCraft II riffs (read: mods) on Bejeweled, Iron Chef and Left 4 Dead. These are just the beta versions, though. Blizzard explains rules and how to access the mods on their blog.
Blizzard has released a big update for StarCraft II: Wings of Liberty, adding new chat channels, customisable hotkeys, a Master League tier and an “extreme” graphics option. More on balance changes and bug fixes at Battle.net.