Caveats In Reselling DSL Bandwidth To Neighbors?

chrisleetn writes "I'm contemplating getting Slashdot (Speakeasy) 6Mbps broadband or something similar and offering wireless internet access to my neighborhood. Speakeasy even has a plan to allow this. What should I be aware of as far as legal/business/regulatory implications? I know I need to restrict obvious illegal stuff and probably p2p to be safe, but is the local cable modem company going to come after me for competing with them? Has anyone done this who can offer some insight?"