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The picoWeb server - but I'm not sure whether it has any inputs/outputs. I believe the source and schematics are available.

Yes, that's it (though I thouhgt I remembered similar ones with some I/O besides RS/232 this one seems to have). Schematics and SW is here. The commercial dev system is not that cheap, though; the single-port terminal server Cris found is cheaper.

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Microchip has a TCP/IP stack for its PIC controllers, so you could re-invent the picoWeb wheel. It would be cool to use the new power-over-Ethernet standard so that the doorbell only needs cat5 (of course, you could add this to the picoWeb design).

Ah, that would be the coolest approach.
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Dragi "Bonzi" Raos Q#5196 MkII #080000376, 18GB green MkIIa #040103247, 60GB blue