In my class we have:

Wii: 1 guy have it. and nobody talk about the wii.

360: we have 3 and the son of one teacher have one. Its the most popular of all the systems.

ps3: nobody have it. $730 it is to expensive, and nobody talk about games for the ps3.

1 DS (my ds) and 3 psp. The psp is more popular in the handheald market BUT more people, specially the girls, likes my DS, jejejeje.

6 or 7 people use their pc to play FIFA.

Without a dobut the xbox is the most popular system, and i am "popular" because of the videogames.

I don't know anyone with a PS3. I do know lots of people with Wii's and 360s though and then theres also a large number of people at my school that play computer games.

I've seen a couple of PSPs around my university. No DS. Although they didn't seem to be playing games with it. I saw it playing one time (Ridge Racer). But there's always a couple of people playing counterstrike on library PCs. I don't know how they manage that considering you're not allowed to install games on those PCs. If I knew, I so be playing online multiplayers every night.

My school
Xbox 360- Very popular, every guy has one on campus
Wii - Very popular in the girls dorms hehe
PS3 - Very popular with the kids in the anime clubs but not much else

I don't go to school anymore, but i made most of my mates buy a 360. about 12 of them have one.

We even have a halo 3 clan. hehehehe

Well my school has a PS3 a 360 and a Wii, its pretty crowded in there most of the time too so I would say pretty popular.

Although, I think you meant the question in a different way...