I have a new, still in the box, PLX Kiwi Wifi for your Iphone or Ipod to connect to your OBDII port in your car. You can check codes, setup custom gauges to monitor engine vitals, data log, and much more. I just bought this, and haven't even been able to try it because my Iphone is broken. I replaced it with a Droid, and will be using a different setup in my car, so I have no use for this. $130 shipped/paypaled (to lower 48 states), which is much less then I just paid a couple weeks ago for it.

Here is a description from the PLX site:

Kiwi Wifi is a plug and play wireless device measuring only 2.75 x 1.25 x 0.6 inches. Kiwi Wifi comes attached with a 6 ft OBDII cable for easy installation. It also comes included with a power switch built-in to prevent the need for having to constantly disconnect your unit from the OBDII port. It is compatible with 1996 and later vehicles. Connecting to your iPhone / iPod touch is made by 802.11a/b/g connection in adHoc mode. This unit is upgradeable to Kiwi Wifi + iMFD

 

Bump. Someone needs to take advantage of my misfortune!