I'll admit I rarely write comments. About the only time I do is if the code has "gotchas": basically it does things in a way you wouldn't normally expect but actually has to be that way. The rest of the time I rely on properly named classes, methods, and variables. In a sense the code is self-documenting. I often use names that are longer than necessary but really relate what a variable's intended function is, I'll even spend a good bit of time naming and renaming a class or method until I hit upon a name that encapsulates its function. And when I'm writing C# object-oriented code I take the time as well to organize my classes such that using them is a bit self-documenting.

I know proper documentation is nice but I've found so far this to be a nice balance between writing code and maintaining up-to-date documentation.