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yes, people are. i use it daily (on top of p9p and 9vx). there are people building commercial products, using plan9 both for development and in the product itself. there are many research projects using it, including running it on some of the largest computers on the planet.

it'd be hard (but not impossible) to use it to the exclusion of other things as a desktop today, because you can't get a very good native browser (there are workarounds, but they're all tough in different ways). there's lots of other environments where it makes great sense, though.

Russ Cox still uses Plan9/Acme: http://russ.cox.usesthis.com/

According to that (an interesting link, thanks), Russ uses Plan 9 from Userspace, which is similar in feel but still counts as running Linux for the purpose of my question, I think.

One of the national labs uses or has used Plan 9 for cluster computing. The leader of that effort is Ron Minnich.