I have been tracking this as best as I can-

Seeing soft pulls on CR and looking for "pre-approved" item in the mail.

I also get a ton of pre-approved auto stuff from companies I have done business in the past the is just "CRM" stuff.

I know that GMAC just pulled a soft on my Aug 10th -
I have a current loan 3 years old with them and I expect an offer soon (not that I am taking them up on it)