If ever those who are still dragging heels over the move from SL to Lion needed a heads up, the stats are there...Keep up to date, adopt sensible practice and you should be fine....Sticking with "Old faithful" for the sake of it makes no sense at all now.
I'd love to move my old iMac to Lion, since I suffer from "compulsive updating syndrome", but I really can't: Core Duo... And no, I won't update a perfectly good music and internet machine.
My MBP is always up to date, though.
Didn't have that malware on either. I wonder, could you get it with Chrome? I don't use Safari.