Props to the admins at BTCGuild - like the other big pools they were/are getting DOS'd but unlike the other big pools (I mine on all of them) they were not affected by the attack much at all.
p.s. although the attacks are extremely annoying It did make me smile to see Deepbit at 100 g/hash today. Last time I saw that was last spring.
The only reason I've been able to stay online (although we have had a few outages when this all started) is that a large potion of the botnet IP addresses were forwarded to our ISP, which may have been what sparked these attacks in the first place. I had been actively gathering IPs of known infected machines for about 3 days, and let our ISP know that we would be forwarding them a list of infected machines that we would like to get filtered from our servers [I had received emails from the ISP about null'ing our server due to complaints about infected machines pointing at our servers].
A few hours after submitting the list, the attacks started. This is similar to what happened back in July when I banned a large botnet at the server level, and they DDoS'd us offline for 2 or 3 days. This time it seems like they're just throwing a fit and trying to take down all 3 major pools. The small pools can't handle the load of a botnet, and the large ones keep working on kicking them out.