After repairing, parting out, upgrading, selling well over 100 T61/T61p units in the past few months I had never even seen this device... until now.http://img535.imageshack.us/img535/4024/img1839bk.jpghttp://img840.imageshack.us/img840/8063/img1838bf.jpg
That answers my question of what the half size mini pcie slot was for, since it's rarely used. It also seems this device has a special antenna that leads on the right hinge, where all the wifi/wwan leads are on the left. I believe this is the only option that I don't have installed on my T61p yet, so now I guess I can consider the unit maxed out, it's current specs are...
X9000 2.8ghz core2extreme
Intel 320series 160gb SSD
Ultrabay 750gb hatachi 7200rpm
sim card reader
Not much more I can do to this after I install with wireless usb, but I'm still clueless what I can use it for. The wiki page for certified wireless usb says it works with harddrives, cameras, printers, mp3 players, etc... but I have yet to see one that supports it. I'm guessing it never really caught on. I'm also wondering about there being a problem trying to use it and bluetooth, since this LED clearplate has wusb but no bluetooth and the other has the reverse... not sure if they are made to both work on the same machine.