OK I normally keep this stuff for clients, but IMO Google in the last 14 days looks like they are hitting sites on both sides, sites that sell backlinks and sites that buy backlinks – and there has been collateral damage again.
For me this is a hard call to make on what you should do personally, normally I say weather the storm, but this looks a little different to me, normally Google attacks the webmaster from one side at a time to stop collateral damage. For example, if you sell links your site might not pass link juice or page rank while those links are still on your site. Clean up and after a update or two you should be OK. Buying links, well that’s another ball game. You could loose the domain forever if you don’t move quick enough.