If you have the money, buy the Pila charger. It works much better for li-ion batteries than the other ones listed.

I have 5837 (http://www.dealextreme.com/details.dx/sku.5837) and it overcharges if you leave it after the green turns on. The cheaper chargers might work fine if you baby the charge and remove the batteries the instant the light turns green, but since li-ions can be dangerous if overcharged, I wouldn't risk it. You really shouldn't rely on the protection circuit to work, since those are cheapie batteries and the protection is a last resort.