Hi, I figured I'd report on what I use, since it took a while to find it. I wanted a retractable cable, and the Nokia seems picky about them. After trying some from eBay, I found that this one works:

http://www.boxwave.com/products/mini...-n800_2569.htm

It's also picky about battery packs. The following two work:

http://www.xantrex.com/web/id/242/p/1/pt/32/product.asp
http://www.apc.com/resource/include/...base_sku=UPB10

The Iogear and Lenmar battery packs don't work. I don't know how long they run for, I use them as overnight chargers for the nightstand when traveling.