Well, I went with a device that does a little more, that I keep in my car 24x7 and use every time I drive for a little more money, $159. I've got the Scangauge2. I love it.
http://www.scangauge.com/
This is similar for $60 (after a $10 mail in rebate) plus about $10 in shipping. I've got a buddy at work that bought one, and some other folks on the net have bought them and they seem to work well enough.
There are lots of apps for Android phones and some for iPhones these days. There are cabled and blue tooth OBDII plugs for phones or PCs (or even an ipod touch, I'm pretty sure)
__________________
Steve
'08 Boxster RS60 Spyder #0099/1960
- never named a car before, but this is Charlotte.
'88 targa
SOLD 2004 - gone but not forgotten