Let’s get one thing straight.  The media, as usual, is not only blowing this out of proportion but also not keying on the right part of the problem.  This is not a Mac issue but a java problem.  Java had and exploit(java itself has become an exploit…much like activex..but worse) that apple didn’t patch as quickly as oracle(the developer of java).  Keep in mind that OSX Lion does not contain java so only folks who forever whatever reason can’t or won’t run the latest Lion release were the only ones vulnerable.  Frankly I banished java from my network a looooong time ago…as the amount of websites that require it for proper operation aren’t enough to even bother with.  How to NOT get infected?  uninstall Java..never install it in the first place.