Burton Audex Radio Frequency Rf Ipod Remote Control and Receiver - Black
It works great.  It lets the iPod stay hidden from the elements while I can use the water resistant remote to operate it.  It has a radio frequencied remote so it doesn't have to physically see the iPod to control it.  Mine came with the hoodie, but the price on the hoodie was alot.  The kits for just the remote is usually $45 retail.  The hoodies and jackets retail for several times that amount though.  My hoodie has a little pocket meant to keep the remote in though.  So it helps protect the remote too.