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					Originally Posted by sd_boxster
					
				 While I agree with Vath that free is a great price, having one of your own in the garage can be priceless when the light pops on at 11:30PM... especially if you have insomnia like mine that's just itching for any reason to keep you awake. | 
	
 
Agreed.  I use AutoTap, which has data logging capability in addition to OBDII code scanning and DTC-clearing features.  Unfortunately, there are quite a few valuable parameters that AutoTap won't record on my Boxster in data-logging mode, but it's better than nothing, and it works fine for reading and clearing codes.  Just used it last night, in fact.