I have used G4 and intel minis as routers, servers and firewalls with great success. The performance of the current model is incredible, considering the price. Whenever the need arises, I use the aforementioned sustworks-drivers to add additional ethernet interfaces – so far without issues. Disk storage is of course a limitation that minis have. Using an external FW400 solution is the easiest way to expand, but performance is limitted. It should, however, be possible to use the internal SATA-connector and route it to an external enclosure, offering you many more and higher performance storage options. Lastly, the Mac mini’s socketted CPU allows for an upgrade path to Core2Duo-silicon. I truly love these little boxes – reasonably adaptable, inexpensive and highly reliable!
That said, you could install a CPU-upgrade in your G4 and get a few more years of use out of it, but the price of the upgrade alone would be close to that of a new Mac mini.
HTH,
Ron
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