iPod power

I'm pretty sure I asked this, it was some thread that got from something else to insomnia and from that to iPod, but I can't find it anywhere… need to hit that 'watch this thread' button more religiously. Anyway, what do you all use to keep a charge on your iPod or whatever? Chargers are either 10 oz (too much) or $100 (too much.) The great deal under deals, $30 ish after rebate, is sold out, so don't point me there. Ideas? Thanks!