Bestofmedia is about as Anti-SOPA/PIPA as possible. I've personally been on several radio shows on behalf of Tom's Hardware opposing SOPA on behalf of the site.
As for the blackout - we discussed this and it wasn't technologically doable for us, or we would have. We've been around for 16 years, and if the site was a human it would be driving now and working a part-time shift at the local burger barn. That's like a zillion in net years, and agility can be an issue with a site this size sometimes. If there's another one and it comes with sufficient heads-up, I'm sure we'll be in.
In the interim, we'll continue to oppose SOPA/PIPA as loudly as we can.