I have seen your comment on the main page and i would give a second thought about using the "S" path as they maybe falling into the overused area or even being not memorable enough:
http://www.wapa.gov/es/pubs/esb/2001/01Jun/graphics/GreatRiverLogo.jpghttp://www.pro-logo-design.com/images/logo_blueriver.jpghttp://www.br-engineering.com/blueriver_logo.jpgMore ideas to come based on your feedback though .
Cheers
Emi