I believe that there's a Flash 7 installer available for OS9, and youtube works with Flash 7.

I've heard it works semi-decently on a fairly moderate G3 system, a beige at 400MHz with example. I'll have to ask the person I knew with a beige who had it going.

Using this procedure you can also get Youtube on Windows 98 and Windows NT4, and it works great on older/slower Pentium III systems. (Just as a comparison to the Mac version)

Pandora streaming radio should also work with Flash 7, at least it did maybe a year ago.
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