Gary emailed me this article with the comment "Please tell me this is a hoax." Sadly, I think it's not. Here are some highlights from the article:

Grooming isn't just for dogs anymore, and many pet owners are bringing in their rats to groomers like Garrison, who uses waterless shampoo to make their coats shine and smell sweet... "We need to be there for all our clients," Garrison said. "I think we might be the only place around that grooms rats."...
"The most difficult part of grooming rats is trimming their nails," Garrison said. "They have very small feet." Ferguson recommends pet owners get their animals groomed at least once a month to protect them from parasites. "I love rats," she said. "It's an obsession to me. Sometimes when they get nervous they (urinate) but they don't usually bite. We know how to handle them because that's what we do."

A quick Google search brings up quite a few resources for rat owners who want to groom their pets. The biggest challenge for rat lovers seems to be the little drops of urine the delightful creatures leave as they walk around.