Be careful of the phrase "current maps" or similar phrases. They usually means the latest or current US Geological Survey maps. Many sites use these maps, such as TerraServer.com, Topozone.com, and Mapcard.com.
If you use a GPS I recommend ExpertGPS at
http://www.expertgps.com/default.asp
It allows to to travel an then overlay your track on the topo and aerial maps. You can also scout a large area quickly, finding funnels, creek bottoms and other desirable features. You still need to get on the property and check the details, as the maps don't show every feature, but they help eliminate a lot of the property as potential hunting area. If you spot a feature on the map then you can mark it, print the map and later investigate it on foot.
Remember that the maps may be 10-20 years old, but most of the areas haven't changed that much. On one property that I hunted, the map showed open fields, but the farmer retired and planted pine trees. Once on the property, we knew where there were small pines and great bedding areas.