CNET - The other day, in my post listing the best money-saving tips of 2012, I suggested ditching your landline in favor of a voice-over-IP option like MagicJack or Ooma.
But there's another option, one that lets you embrace the goodness that is Google Voice: Obihai's OBi100 VoIP phone adapter, which Amazon has for $39.24 shipped. It's been that price for a while now, but Google's recent announcement that free calling would continue through 2013 makes this worth another look.
The OBi100 works much like an Ooma or MagicJack Plus: You plug your existing cordless phone system into the adapter, plug the adapter into your router, and presto: you've got dial tone.
Okay, there's a bit more to the setup than that, as you have to configure it for use with your Google Voice account (or one of many other supported services, like Sipgate). But once that's done, you should be looking at totally free local and long-distance calling.