This is a nice portable charger that was recently discontinued, retails for $119.
Charges most iPads, tablets, netbooks. 61wh. That's 61,000 mah. Very thin.
Definitely far better than my old portable charger, which literally is a brick.
Rumor has it that it works with MikeGuyver's MagSafe adapters, but haven't researched that thuroughly.
Note: This charger requires you to use one of your laptop/netbook chargers, to recharge it. It does not come with its own AC adapter, but a separate set of charger tips to receive power from most notebook/netbook chargers. This is important to know for those with Mac as it does not receive power from a MagSafe adapter, nor does it have a MagSafe tip for output.
Amazon does have a few left at the $59 price point, but after that it goes $69 on up.