I do, but it's not a traditional line; it's VoIP. I find it useful to have another calling option for 3 reasons:
1. My cell phone (Sprint) doesn't always get great service.
2. VoIP direct international dialing rates are much cheaper than cell phone international plans, especially to foreign cell/mobile numbers. I don't like jumping through calling card hoops. Calling cards suck!
3. 3rd benefit is the speaker phone is better quality

for when you have to call places that require u to hold, which I hate!
I also have a USA cell and a foreign tri-band for travel, but even though it's not my main phone contact anymore, a land line still has its place.
If you think you're too cool to use a land line:
