Same here - just a little more geeky, with a transparent box. ;-)
For me it's running a couple small utilities and a tincd based network, connecting various machines of my brother and me. Mostly - it's a small always-on playground machine.
The USB/Wifi dongle is interesting. I don't know much about this flavor of adapter, were the drivers already in the kernel? Any problems getting it running?
My Pi is pretty close to my wifi router and I have the same stick - 4-5mb/s depending on what I'm doing with the data. You may need to turn power management off for the device.