We have two scrolling led signs over at NottingHack both show the same stuff but the firmware is different, they show messages from IRC, twitter, google groups.
There some info about both on the NottingHack wiki and code is distributed between github and google code, links should be on the wiki somewhere.
Everything inter talks using mqtt over the network and we have an irc<>mqtt bot that sits in the #nottinghack irc channel.
Most led signs are just shift registers so very easy to actually output to.
London also have similar led<>IRC sign and again it's all on there wiki
I would explain more but down at EMFcamp right now. If you can get over to NottingHack one Wednesday night I can go thought it a lot quicker in person.
'RepRap' Matt
Sent from my iPad 2
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