If you worry about deterrents like rain, waves etc destroying your iPod, worry not as the DRYPOD® series of protective waterproof, intuitive hard-shell cases are just what you need. These cases designed exclusively for the Gen 4 iPod, Nano and Gen 5 Video iPod models incorporates the 'flex-pad' technology for manipulation of the iPod's control wheel via the case and shields the iPod from external sources.

The DRYPOD cases include an elastic neoprene arm band, comfort-adjust lanyard and stainless steel belt clip and are compliant with immersion and rain tests. Infact independent laboratories have also tested the cases and give it their seal of approval. No word on pricing or availability but expect them to create a wave (pun unintended) when the hit the markets. For more information visit:
http://www.drypodcase.com/waterproof_ipod_case_drypod.html