In my efforts to figure out how to pay my FIOS bill online, I learned that FIOS accounts come with email and web space too - cool!
I've used this feature in the past with Verizon DSL. The email doesn't do much for me, but the web hosting is helpful - can't have too many web hosting accounts, right?
Unfortunately, Comcast charges extra for this feature, even the business products. Too bad, I would use it if I could. Comcast isn't all bad though, at least their SMC8014 router is better than the Verizon's Actiontec MI424WR.