As mud. Notice the little box on the USB charger? That's a 6V booster.

I'm not at all clear what you're saying, or how to make what I'm saying any simpler. I have many devices. All can be run from 5v (I note that my Nokia N800 charger puts out 5v). I'd rather avoid proprietary single-use in favor of standard and multi-purpose.

The best solution I can imagine, then, is tips that go on USB cables that turn them into charging cables for particular devices.

I'm not even sure what you're saying about that charger. It's 6v. Presumably, it charges a little faster. You know, great. But I'd still prefer the standard and general purpose, and I can't put that any more clearly.

So: Does anyone know of a source of USB cable-charging tip adapters?

No, but I wonder how hard it would be to make a small adapter to convert say, iGo tips to USB. If you figure anything out, please post it back!

Bruce