I am not sure... but I think that there is a way to do this. If it's there for the general public, I do now know. Though you wouldn't get much information from your car, because it lacks OBD, but you do have a CAN that monitors several systems.
I have often wondered this question myself... would love to hookup my car to my laptop via the OBDII with a connector and some sofrware!
2006 E350 w/ 155k miles (Daily Driver)
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)