Here's a fascinating article about how the U.S. Postal Service cut a deal with a band called "Postal Service" so that the band could keep the name, but the band has to promote the postal service. Excerpt:

We're always looking for ways to extend our brand and reach into areas we don't typically reach," he said, "like teens and people in their 20's, who are typically doing business online and are not familiar with the Postal Service."

Not familiar with the Postal Service?

"I have three kids, and they do most of their correspondence online," Mr. Thuro said.

...

[The band consists of] two of the least offensive rock stars imaginable, and their music - bubbly yet pensive electronic pop with earnest vocals by Mr. Gibbard - is unlikely to dissuade anyone from buying stamps.

UPDATE: Their music is actually pretty cool.