Well there was this one posted last year by NWGrayefulDiver:
http://darwin.bio.uci.edu/~rvilla/waiver.html
Here was a draft waiver I posted recently:
http://www.scubaboard.com/showpost.php?p=1016645&postcount=85
And of course this is not legal advice so here's my own disclaimer:
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This mail/post may include technical inaccuracies or typographical errors that will be corrected as they are discovered at Miketsp's sole discretion. Also, changes may periodically be added to the information contained herein. These corrections and changes may be incorporated into this mail/post at a later date. Miketsp may at any time make modifications, improvements and/or changes to these Terms and Conditions, the information, names, images, pictures, logos and icons displayed within the mail/post or the recommendation, opinions, advice, products and services referred to within, with or without notice. This mail/post may contain links to or references to other Websites. As the Internet is maintained independently at thousands of sites around the world, the information, names, images, pictures, logos and icons that may be accessed may originate outside the boundaries of this mail/post and it is tacitly accepted that Miketsp will have no control. Therefore, Miketsp shall have no obligation or responsibility regarding any content derived, obtained, accessed within, through or outside this mail/post. This mail/post may not be forwarded, reproduced or cited unless you agree not to add, alter, substitute or amend partially or in whole any information provided by Miketsp.
So there...