BTI is a good company with good reliable products. I actually have a battery backup for my 5g iPod and it has amazing life...althought its rather big.
For the iPhone I'm looking at :
http://mophie.com/products/juice-pack-info/?pod=iPhone
Quote:
The All-New mophie 'Juice Pack' is designed to extend the time you can Rock, Talk, Surf and Send with your first generation iPhone
The juice pack is a rechargeable lithium polimer battery in the form of a non-slip, soft grip case. It extends the time that you can use your iPhone in these ways (additional hours):
Standby Time - Up to 250 hours
Audio Playback - Up to 24 hours
Talk Time - Up to 8 hours
Video Playback - Up to 7 hours
Internet Use - Up to 6 hours
All juiced up and ready to go... straight out of the box!
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It's rather expensive at $99 but there is high value (for me) in having a streamlined solution that doesn't dangle by the power connector making use not cumbersome at all as well as sporting very good specs as far as user time extension.
It's expensive but it looks like the best option out there as far as features. It should be available within a month from what I can gleen from the website.