DIY Line Out Cable - Works!

I’d definitely like some more info on this, and would be interested in seeing a widely produced or even commercial application in the near future.  Having to jump the player itself makes a commercial version unlikely, but SanDisk could easily fix this by allowing line-out w/o any power input (like Ipods do) in a future FW upgrade.  That’s one of the features at the top of my wish-list, as it would allow these cables to be actually produced.  I’m interested in this, and may wish to try it myself, though I’m a little wary of frying my Sansa if something shorts out, or I jumper the wrong pins…