If you have a iPhone 3G, then you know all too well that the power gets sucked up from the battery over a period of 8 hours. 3 or less if you have the 3G turned off. I haven’t done a scientific survey, so those numbers are just guesstimates.
I knew about this issue before I even got my 3G iPhone, so as I usually do, I started to research the options available for back-up battery options. 
I looked at many sites, and eventually picked FastMac’s iV battery pack. It has twice the full runtime of the iPhone’s existing power cell, a light on the side the camera is on, (but on the opposite edge) and it was unanimously the Editor’s choice for Best In Show at the 2008 MacWorld.
This was my first official online purchase on my iPhone, which made it that much more sweet. One problem though. I didn’t think about the fact that maybe the 3G wouldn’t fit in the pack. I thought, “Hmm. I’m sure it’ll work, why wouldn’t it?” This was after seeing that the iPod dock I had fit perfectly.
After a week of nothing other than an e-mail stating that now my iV battery pack would ship in “just 7 days!!” – I received a phone call from them to verify my address. I asked, “One question – will this work with the 3G phone?” The guy told me, “well, yes it will work, but if you’re willing to wait 4-8 weeks, we’ll send you the new 3G model at no additional charge.” SWEET!
Of course I went for it. I had already been without battery back-up for 14 or so days, 4-8 weeks will fly by. So, the reason for this post is: I highly recommend FastMac. They “Get It” when it comes to the Apple experience and especially the fan base. Those t-shirts are another testament to that – the one I like best is the black shirt with the official Apple, “Works with iPhone” label.
Now if I could just wrangle them into an affiliate program, I’d be set.