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The other way I use flags is to temporarely keep a good thread handy. Not beeing a native English speaker, I will need to read that Googlenoia thread many times over to understand it in full. When done, I usually delete the flag. I sometimes print some threads I find to be of great value.
So, how about your set of flags?
For my own purposes, I usually have some long-range development plan in mind, often involving scripts or .htaccess -i.e., items I'm not particularly well-versed in. If you read here over a period of time the pieces often start falling into place, but the answer comes from a composite of 3 or 4 threads gathered over time. I use the flags to help gather them in.