I wanted to call your attention to a column which I wrote back in April about a situation that could cause some people to lose Internet access next week.
Basically, some computers are infected with a virus that changed one of their settings and has been causing them to use the wrong Domain Name Server, a sort of Internet directory that converts domain names into numeric addresses. The good news is that the FBI found the culprits and has been running what they intended to be a SPAM server as a legitimate DNS server. But the FBI doesn't want to be in the DNS service forever and has been telling users for months that it will shut down the servers next week. If your computer is infected, it won't be able to connect to the Internet once those servers are shut down.
Here's a link to my column, with more details, including how to find out if you're infected: