Just recently I got a chance to order and use another compact USB GPS receiver – ND 100 by GlobalSat.
Since I already have the Prolific chipset drivers installed, ND-100 worked right out of the box. In my test it quickly acquired a fix and provided position to within about 5 feet – all *indoors*. It also appears to have a bit less of a stationary “course drift” than my BU-353s, though that could be individual device issue.
The primary advantage of this device is a form factor – rather than being a GPS “mouse” it is a “USB stick”, the size of average external flash drive, though it feels a bit heftier. It fits well into my netbook and avoids messing with wires. That said, one drawback may be that it requires additional space to the side of netbook, least it catches onto something and pops out of the USB socket. No big deal though, it can be plugged right back in – and no harm done. PolarCOM will reacquire the connection shortly.
All in all another good option, available on Amazon for about $35.