Giving up the land line

My wife and I talked recently about giving up our POTS. We use our cell phones most of the time anyway; we don't even have long-distance on the land line anymore.

I Googled a bit and found the Dock-N-Talk, a cell phone docking station which bridges a cell phone and standard cordless phones (which we already have). With what we're paying for POTS, it would pay for itself in 7 months.