Seeking MacBook Air (13", late 2010 model) external battery options. Here's what came up in quick search: http://www.quickertek.com/products/macbook_air_charger.php http://www.quickertek.com/products/apple_juicz.php http://www.batterygeek.net/MacBook-Laptop-Tablet-PC-Battery-Pack-s/1.htm (several product options) 3GJUICE MAC AIR external battery Tekkeon MP3750, MP3450 or MP3450i (Edit 2011-04-29: added to list. MagSafe adapter available if you work at it, see below.) Any other options/products? Not sure of Magsafe/MBA-friendly options for Tekkeon MP3750, MP3450 or MP3450i. ('R2' flavor of MP3450i sold at 3gstore.com; not sure what 'R2' does, don't yet see 'R2' description/notes at Tekkeon.com.) Also: can anyone share their experience with above products/solutions/options... or any others?