Actually it leaves it on no matter what choice you make during install on all the 7.x and 8.x versions. I always had to go in and diable it for Oracle. I think they finally fixed it in 9, but I've since switched to Gentoo and haven't installed RH in a while.

As for examples, the last broadcast UDP client I saw was the Net::mDNS module that is used to send and receive multicast dns over udp for things like Apple's Rendezvous. You can get it from CPAN.

HTH