Two quick points about Comcast High Speed Internet (HSI):

• Do not rent a modem from them! You can use your own if you buy one based on compatible modems. I just bought one for $30 off ebay. At $5/mo rental fee, this is a no brainer. But caveat emptor, maybe, for triple play.
• Do NOT use Comcast default jank DNS redirect “feature” for domains that can’t be resolved. Your browser is yours, so just say no (note that link will only work if you’re on Comcast’s network).