The latest information from management on the impairment of service:
We are still working to contain the ongoing DDoS attack, and to this end we have recently upgraded our service with Rackspace. This should restore access to our readers who have been blocked for the last week. However, some users may still be blocked, so please continue to send blocked IP addresses to webmaster@scienceblogs.com (or have them send us their IP addresses directly). As a preventative measure, please send your own IP addresses as well; we will add these addresses to Rackspace's whitelist.
The problems should start easing up. If not, harass the admin at the address above.
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We've finally received some information from the overlords about the recent problems. We're being attacked.
Dear Bloggers,
For some of you, access to ScienceBlogs has been wonky. It's not because our Seed Overlords have neglected to feed the hamsters that power the Blogerator 9600. Turns out it's a denial-of-service attack:
You, my readers, have been complaining about flakiness in Sb that goes above and beyond the usual technical flakiness of the site. So have many other readers, in particular PZ's.