Haven't seen anyone mention this yet... Seidio has posted pics and changed the status to "Now Shipping" for the 3500 extended battery. Looks... interesting.
I might be getting this since I do geocaching with the c:geo app and would love to have both the brightness at 100% and GPS on for 6+ hours without having to turn the screen off at all.
[Linkage]
EDIT: By the way, it's only a tiny bit thicker than the 2150mah battery pack from Verizon for $10 more: Link
In order to obtain the full capacity of your Seidio battery, we highly recommend that you leave the battery/your phone on the charger for an additional 2-3 hours after the charging indicator turns green or the battery status shows full.
I might be getting this since I do geocaching with the c:geo app and would love to have both the brightness at 100% and GPS on for 6+ hours without having to turn the screen off at all.
[Linkage]
EDIT: By the way, it's only a tiny bit thicker than the 2150mah battery pack from Verizon for $10 more: Link