Update: Situation looks resolved as of this morning. Thread on Broadband Reports here. ACCORDING TO WEBROOT, THIS WAS NOT A HACK.
Some jerk(s) are attacking a reputable antispyware vendor.
An apparent DNS hack. Some systems are reporting this, some aren’t. Note that if you’re seeing this hack, you aren’t going to be able to send mail to them either.
In other words, someone is going after Webroot and it’s nasty. Man, this really tees me off.
3 pm EST today
4:20 pm EST today 
Just got this reported from Eric Howes when he tried to update SpySweeper.
Ouch, this has gotta hurt.
If anyone has more data, please drop a note in the comments section.
Alex