How do you flag code so that you can come back later and work on it?

Question

In C# I use the #warning and #error directives,

#warning This is dirty code...
#error Fix this before everything explodes!
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Answer 1

I use a combination of //TODO: //HACK: and throw new NotImplementedException(); on my methods to denote work that was not done. Also, I add bookmarks in Visual Studio on lines that are incomplete.