[nu2s3]

I was on the phone and wanted to make a note but wasn't sure of the quickest, best way to add a brief, note. Voice? What if you're in an area/situation where voice would not be appropriate? Thanks for any input.

[mctl]

I use Evernote.
With it, you can write notes, attach several types of media to a note, take a picture/snapshot, record audio/dictate. There's also a handy sync feature.

[whatsitsname]

I use "status notes" by Adrian. The notes will stay in the notification bar if you want so you can recall upon it easily.

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[Aeroms]

I use TalkNotes Plus. It is the ONLY app that integrates notes functionality with the actual call. None of the big name notes apps have this feature.