Well I got just over 17k miles out of my front pads, but I'm sure you know this... Rear pads are still 65% good.
And as most of you know, I sometimes drive hard, but not all the times, when I'm not driving hard, I always time lights, let of the gas a long ways before a stop, etc.
But what I think really killed my pads was my trip to San Francisco... there's nothing like going 120 and then having to abruptly slow down to 60... I think that really sheered the crap out of them, made a few stops like that on the way up and back (1000 miles roundtrip).

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
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!)