I've actually seen a disclaimer that a client of mine uses on their preforeclosure reports that limits their liability to $200.  The one I use doesn't completely limit my liability, nor does it mention a specific dollar amount:

"This report is intended for informational purposes only, and is not an opinion of title, nor a policy of title insurance, nor a committment to issue such policy.  All information contained herein was obtained by an examination of public records in the above named jurisdiction, and is as accurate as reasonable care can make it.  Jireh Business Information Solutions, Inc. makes no warranties, express or implied, regarding the insurability or marketability of title for the subject property and assumes no liablilty whatsoever for the accuracy of the infomation contained herein beyond the exercise of such reasonable care."

It is my understanding that rendering an opinion of title or offering a warranty/guarantee of marketable title constitutes the unauthorized practice of law in the Commonwealth of Pennsylvania.  My disclaimer essentially sets forth exactly what the client is getting for their money, so it's as much for their benefit as it is for mine.

Regards,
Scott Perry