Most discussions of stealth camping cover the basics well enough (Ken Kifer's site does a good job).
There are some other points, though, that rarely get mentioned.
Not long ago, I was stealth camping on the far side of a field. The land sloped down at the edge of the field, and then leveled out. Parts of the level area couldn't be seen from anywhere else. It seemed almost perfect.
I did have the thought, though, just before going to sleep, that it seemed like just the sort of place that local youths might choose for making out.
And sure enough, I was awakened (shortly after falling asleep) by some laughter and horsing around. They were just around the bend a bit, maybe forty feet away. The girl seemed to have had a few, and the guy seemed to have a lot of staying power. It was somewhat amusing at first, but then I couldn't get back to sleep. In the end, it went on for hours, and I finally gave up hoping they would leave soon. I left. They seemed a bit surprised, but continued more or less uninterrupted. I ended up with very little sleep, which doesn't help the quality of the next day.
So, that's one thing they don't tell you about.
Another: Sometimes pot growers find the good, hidden places too. They are also stealth-minded. It can be awkward if you are discovered near a growing area. (This has actually happened.)
There are probably some other things to avoid as well, and some other points about stealth camping that are not always covered. If anyone else has any experiences or ideas along these lines, it would be interesting to hear more.