The Xbox adapter works with the 360. Just keep in mind that:
1) it's a bit bulkier than the 360 adapter. Not a massive deal, but for some people in small rooms, you might be looking for every inch of free space you can find.
2) it requires an external power source...that is, you need to plug it in.
3) it only works with WEP, which is the lowest form of encryption. Again, not a huge deal, but WEP is pretty easy to crack, if you're unlucky enough to have some jackass trying to crack into your network.