Something you should be careful of;
Nick wrote;
>  Have you seen this???
>  http://www.gravitypower.com/
>  They want 1000 USD for the `secret` (fully refundable if they grant 
>  you a licence!)   -   Nick 
Geez, $1600 for a report?....not a working machine, just a
document...and the guarantee says only if you can prove that the report
is flawed or unworkable...smells like a serious scam...and they tell you
nothing, only that it is 'circulating fluids'....not with my money....
For hoots, I checked to see who owns the domain name gravitypower.com
and found;
Registrant: 
NetInvest Ltd. (GRAVITYPOWER-DOM)
Station Court
Great Shelford, Cambridgeshire CB2 5NE
GB
Domain Name: GRAVITYPOWER.COM
Administrative Contact:
Wise, Peter  (PW2777)  peter@NET800.CO.UK
+44 (0)1223 847 405 (FAX) +44 (0)1223 847 396
Technical Contact, Zone Contact:
van den Oever, Jeroen  (JV2574)  Jeroen@NETBANX.COM
+44 (0)1223 847 395 (FAX) +44 (0)1223 847 396
Billing Contact:
van den Oever, Jeroen  (JV2574)  Jeroen@NETBANX.COM
+44 (0)1223 847 395 (FAX) +44 (0)1223 847 396
--- Jerry Wayne Decker / jdecker@keelynet.com http://keelynet.com / "From an Art to a Science" Voice : (214) 324-8741 / FAX : (214) 324-3501 KeelyNet - PO BOX 870716 - Mesquite - Republic of Texas - 75187