I bought this, arrived yesterday,
http://www.amazon.co.uk/New-Trent-iCruiser-IMP1000-Blackberry/dp/B004CHMP50
Should recharge my smartphone and tablet during a 9hr flight out to Seattle ... I'll pop back in a week to comment on its performance but so far I've recharged my Samsung Galaxy S2 in under 1hr from no charge, expecting the iPad2 to recharge in less that two hours ... sleek little unit, good form factor, recessed power button, weight isn't much of a problem