A/c charging

USB Hub with external power adapter. It'll provide full 900mA per port.

 

I think you need 2.1 amps to charge the iPad, or at least charge it quick enough (at least twice as long).

There aren't that many hubs that provide that, and Apple uses a proprietary method to do so (of COURSE). That proprietary stuff is what the iPad uses to figure out that it can draw 1.5 amps to do the fast charge; I'm not sure if any DIYer has figured out how to do that yet. But meanwhile you can use various wall warts from like Monoprice; theirs is less than $10. Isound has a 4 port one at Walmart.

 

You can easily find many options via Google. Here's one hit from a quick search:
http://www.kensington.com/kensingto...usb-wall-charger-with-30-pin-apple-cable.aspx

If you seriously can't come up with keywords try: dual usb 2.1 charger

Throw in wall if you want to reduce the number of car charger hits you get. Seriously, learn to fish.

 

www.twelvesouth.com

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Its a discussion forum. It's good to hear from people who have actually used the products.