I can't seem to access my non-wam site hosted on the Mothership, and I noticed one or two other mothership-hosted sites are down, too (checked on isup.me to make sure it's not just me)

Any news would be appreciated.

It looks like it is down. Ariel's and Messygirl's stores seem inaccessible right now as well as vidown.com. http://downforeveryoneorjustme.com/ says that they are down as well.

Seems to be back up now.

Is Mothership Down like Watership Down except with playboy bunnies?

Just some network issues with our upstream internet backbone providers. It's apparently all fixed.