I'm planning to purchase a supernova infinity-8 dynamo hub and wanted to use this during daylight hours to charge my Phone and GPS during bike tours.
What products are available that will work with hub dynamos to charge iphone and Garmin GPS units?
Here's one option:
SUPERNOVA The Plug II Plus USB power supply
Seems pretty expensive at €159, but since it's from SuperNova, it should work perfectly with your hub. It's only rated at 500mA, so it'll only do "slow charging" of your phone - most smart phones these days use a 1000mA (or higher) fast charger.
For those in the USA, here's a domestic source:
$156 + shipping. Still seems expensive given that they sell the hub itself for only $216.
You might want to look at the Biologic ReeCharge by Dahon. It says it hooks up to any standard dynamo hub. The nice thing about this is that it has it's own battery. So the dynamo changes the internal battery and the battery charges your phone/gps/device. This allows you to change while you are resting, as well as provide added protection against sending bad current to your device. I don't have any experience with it, but the idea is sound, and Dahon has many good products. It sells for $100 which isn't too bad considering it has it's own battery.