The useful life of my 6500 has just been increased exponentially! I just got a Comm Slot II Ethernet card for it. Popped the modem out, popped the ethernet card in, started it up, and was online within 90 seconds! It's not overly fast (slower ethernet card coupled with next-to-no RAM in the machine), but it works and takes me online! I'm posting from it right now!
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PPC Macs:

• Power Macintosh G4
  
• B&W Power Macintosh G4
  
• Power Macintosh 6500/225