That effort is aimed at sealing off the domains that infected machines contact for instructions.
Those instructions haven't appeared yet, but the sheer size of the infection would give the malware authors a powerful botnet capable of launching devastating attacks should a move be made toward putting it to work.
Whether or not the coordinated effort, or the bounty, nabs the people behind Downadup, it's a step in the right direction.
But considering the fact that the Downadup/Conficker infection exists at all because of the failure to install a widely publicized critical patch released last October, one can hope that the coordinated effort will extend to solving the still massive, still persistent problem of unpatched vulnerabilities for which patches have long been available.
That, though, will take a lot more than $250,000.