For the USA DeLorme Street Atlas (and their other products) support GPS, as does Microsoft Streets and Trips.
I
hate the human interface of the recent versions of DeLorme Street Atlas. Versions 9 and before are much easier to use IMO. I still use my SA ver 8, even though I have SA 2003. 2003 has serious missing major roads problems in an area of Ohio I use.
Microsoft Streets and Trips is not as nice as the old DeLorme versions since it is very coy about revealing info. You have to click to find much useful stuff. You have to know almost exactly where points of interest are since they don't show up on small scales. That said, I'd choose S&T over the latest DeLorme SA.
I've tried a number of other off-the-shelf mapping products for the USA and don't find them useful.
I've heard good things about Oziexplorer as mentioned above.
You should definitely read
http://gpsinformation.net/ which is a huge noncomercial site run by a couple of retired radio hams. I trust their opinions.
seacue