As of version 2.0, Adobe Air no longer supports PowerPC based Macs! I was unable to find a direct download for a 1.5.x installer anywhere. Fortunately, I discovered this thread which mentions how to get Adobe Air 1.5.x downloaded and installed on older PowerPC based Macs.
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Although this guide seems to have been written for Ubuntu 9.10 (Karmic Koala), I found that it worked for me tethering an iPhone 3GS running IOS 4 to a machine running Ubuntu 10.04 (Lucid Lynx) via USB. Great connectivity speeds with AT&T 3G data and no issues so far…
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The Fajita Burrito at Nuevo Vallarta Mexican restaurant in Canby.

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