Lartza: Being blocked by some services like freenode is an unfortunate result of running an exit node on your home IP. That's part of why most operators run it from a different IP (that, and helping to deal with abuse complaints)
in case you haven't read it: https://blog.torproject.org/blog/tips-running-exit-node-minimal-harassment
we sould really link that from the relay instructions page...
if this is really a problem (and you don't have an alternate IP) then running a non-exit relay would be a good idea