I've got one too. And for the all the naysayers, 1) processor is much faster on the 660 than the 550 (I had one months back), and 2) the resolution is much better, 480 x 272 pixels vs. 320 x 240 pixels, and WQVGA color vs.QVGA.
Battery life is 5 hours vs. 550 @ 4, and who needs a pay-sub to XM? With the faster processor, a 660 can handle well over 1500 mp3 songs on an 8Gb micro SD card, while a 550 will freeze or delay start-up with about 400 songs on an SD card. I have FM traffic for mine on the bike, and MSN traffic, stocks, news, local events, movie times, gas stations, and more in car mount
Here is my start up:
My "cockpit" with it.
Rear view of it on ZTechnik clutch mount
A click releases it from the firm hold of the cradle, and nice carry case comes with, as does a cover plate for the cradle's pins.