While I understand your sentiments Oro and Jim, and I agree on some things, I can't but feel that the subject is a double edged sword - let me try to explain without rambling too much and you guys shoot holes in my comments

Leaving potential water sources off the list for now, I could make an argument that putting the locations of mine prospects, ruins and such things as those has a greater risk associated with it than removing them. For example, take the average hiker (not an explorer, but just a hiker/camper). Most of them will stick to the major trails throughout their hike and a basic USGS map should be more than adequate. However if they see that there is a ruin or mine shaft or something "not far" from the trail, at least a portion of those people will be curious enough to go looking for it - that's when potential problems can occur. In this case, I prefer thinking that "ignorance is bliss," and what they aren't aware of will not cause them problems. You also have the other group that's out looking for either artifacts to take or deface - I don't want a basic map to point that kind of thing out to them
For those of us who specifically seek to get off the beaten path, there are so many resources out there available to us to fill in all the gaps that the USGS maps leave out. It doesn't take that much effort to find maps that point to those things we want to explore, and to be honest, I WANT it to take effort to find some of those things so I can still have that feeling of excitement when I find something that I know not every person hiking the wilderness comes across.
I'm already starting to ramble, so forgive me, but hopefully you sort of understand where I'm coming from with the comments.
In regards to potential water sources, I do agree that ANY AND ALL should be shown on a map, unless there is a good reason to believe it absolutely no longer exists during any season. While some may argue that a person could get into trouble or waste valuable energy looking for a water source that is dried up, if someone is in serious trouble out there, at least there's a CHANCE to find some water - it's better than no chance at all.
Just as an aside, and my guess is we could all tell stories like this...
My total days spent hiking/exploring in the Superstitions so far is only maybe a total of 20-30 days. In that short bit of time, I try to stay mostly off the main trails as I'm not out there to "hike" per se. I consider myself to be a novice at best out there, but I had an experience a couple years ago when I was still even more green than I am now that always strikes me when I think about people who get lost, hurt or die out there.
I was coming out of West Boulder Canyon and starting to head towards where Chuck Aylor's camp was when I ran across a couple people hiking. They were wearing shorts, tennis shoes, short sleeve shirts and hats. They each had a walking stick and a fanny pack with 1 bottle of water each. No other backpack, no other supplies or anything. As I came out of the brush and onto the trail, I sorta scared them a bit, but we chatted briefly and they admitted that they were lost. They had come in from Peralta Road and had planned for a half day hike and got confused somewhere along the trail. Neither one of them had a map or GPS but had just planned to hike down a trail for a few hours and then turn around and come back. I never could figure out where they took a wrong turn, but since it was afternoon by then, I sat down and showed them my map, explained where they were and oriented them so they could get back to the Peralta Trailhead. I was staying out there that night and knew where I was and how to get back, so I gave them my map as well as a couple extra bottles of water and a flashlight in case they didn't get back to the parking lot until dark. I sent them on their way and watched them until they were shortly out of sight. I started setting up my tent and stuff and not less than 30 minutes later here they came back down the trail. As soon as they saw me, they started laughing and told me they had stopped after 10 minutes or so on the trail out and wanted to get a better view for a photo, so they went off the trail just a little bit to look out over a ridge. When they got back to the trail, they had gotten turned around somehow and started walking right back the way they came.
I smiled since they were laughing about it as they headed back out again, but I couldn't help shaking my head when they were out of sight and wondering how many people like that go out there totally unprepared and end up as a statistic.
Paul