I pay about $100/month for one line w/ unlimited calling plus DSL (3355 / 863 Kbps according to the modem). IIRC, when I dropped the second line and dial up in favor of DSL I broke even.

I'd love to drop the land line and go 100% cell phones but my wife does a lot of chatting during the day and doesn't like to use her cell for that for some reason. She'd probably use a lot of minutes that way anyway.