Delete any cookies you are sure you don't need. I prompt for cookies as a default and won't take any I don't absolutely need. That dropped my spam a whole lot. The second thing is, don't google while you are logged in.
If you are logged into Yahoo, AOL, MSN or any similar service and you do a search, that search is sent to spammers with your login address. The reason Google is at $700 in the market is because they understand they are sitting on a valuable commodity, a list of customers and everything they have expressed an interest in.
