USGS maps may be way out of date, but I still heavily rely on the 7.5' quads. I also use Tom Harrison maps -- shaded relief and updated trails with mileage -- for research, but I rarely take them in the field because of the scale. I've found that I need the detail of the 7.5' in the field, esp. when hiking cross-country. I have a cheap GPS -- the Gecko, I think -- that I use for cross-country trips. It sucks up battery life, though, so I only turn it on for brief periods to check my altitude.
Before my computer died I used TOPO, an older version. But I believe it was based on USGS quads, so I don't think it provided more current info. I did like the ability to check elevation gain/loss via the path profile. I don't save waypoints from the field -- on the rare occasion that I go back to a previous spot, I mark it on the map, since that's what I would be taking back out into the field.
As for books, one that's been around a while is "Be Expert with Map and Compass" by Bjorn Kjellstrom. He goes into orienteering a bit. There are local and national orienteering societies that offer courses and events.