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Looks like the Dev team has successfully jailbroke 3.1 for the 3gs. New pwange tool should be released soon.

http://www.xsellize.com/showthread.php?t=65184

Edit: Well somehow i missed the 2 page topic on this already... my bad

But this MuscleNerd tweet makes me think those on 3.1 without SHSH files saved are still out of luck

"sorry it won't cover people stuck at 3.1 without their signed files :( Though that's high on the list (but not for unlock)."
 
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