1. Through the USB cable: you can download PDAnet. Then you can tether to your computer. (only works for windurrs)
2. Ad-hoc wifi sharing. Requires you to have a rooted phone, there is software available to turn your G1 into a wireless AP.
Activesync:
Is software used by windurrs based phones and PDAs. I suppose you could hack something together to get it to work with a G1, but it's fairly pointless, in my opinion at least.
edit: Ah snap, just read the "Magic" portion. I suppose you can use some of this information.
The HTC Magic is the second EVER Android Phone and first launched on Vodafone in Europe on May 1st. With a sexy, slim form factor, 3.2 inch touchscreen and beautiful HVGA resolution, the Magic greatly increased the physical attraction to Android.
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Internet sharing and ActiveSync
