I would say, check again.. That strange connection still showed for a while, even though I had the computer turned off... It finally disappeared when I power cycled the router (it would stay for a long time if I just left it, don't know how long, since I got impatient).. From your other posts, it sure sounds like this may be a possibility...
A q for you, is it actually doing anything? Reason I ask, is that I have a DVR with built in wireless stuff, and it was actually showing up even though it wasn't doing anything..
You said in another post that it was there but you couldn't see it doing anything... Sounds like what I see from my DVR (I haven't installed the software to let me download programs from it yet.. 8/9 Gigabyte files over wireless!?!, just so I can watch a show on a laptop!?!? don't think I care for it)... Got a PDA with built in wireless? My iPAQ was showing up, cuz it was turned on in it's charging cradle.