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|(We're not getting paid for this or anything, it's just a good deal, and a chance to support some other indie developers)
Pay any price you like for five DRM-free, ultra-high-quality indie games -- or donate to charity and get them for free. Sale ends 6 days from now. World of Goo in particular is something you should try if you haven't already.
More SC-related news soon, hopefully.
UPDATE: The above-mentioned offer has been extended, plus they've added an additional game to it. They're also going to take the games open-source, so you can probably expect a few mods or unofficial updates sometime in the future. If you haven't already already picked up the bundle, keep in mind that even paying a very low price would be better for the developers than not buying it at all.
In other news, Valve's Portal is free (to own permanently) providing you grab it before the 24th of May(!) If you don't have it already, there's no reason not to get it now. It even works on the Mac.