Just saw this thing. I was thinking about it just as a tool to have. My Miata is '93 so doesn't apply, but I've got my Speed6 and any future cars will probably be OBDII. My next Miata certainly will be.
http://www.innovatemotorsports.com/products/ot1.php

The device plugs into your OBDII port and will datalog all of your stock sensors... makes great sense on a modern factory turbo car.

I'm familiar with the DashHawk but the cost is prohibitive. The OT-1 is half as much and you just need a laptop... which you'd need anyways with the DashHawk to do any useful viewing of the data.

For $150, is there anything else out there that does the same for less? Anybody have one? Thoughts? Again, I have no specific use or need right now other than as a toy/tool?

 

compare it to a scangauge...or whatever they are called, the logging part is what's cool since you should be able to read to important stuffs.