I write from memory almost all the time. Sometimes this shows in a lack of nuts-n-bolts details, but also in the flow of my reports, as I tend to include commentary that accounts for a more macro-oriented perspective: what's going on at an executive level. I'm sure I have a higher error rate than most on mixing up the exact dates or sometimes the order of a list of events, but generally more is gained than lost by this method.
I do take notes on occasion, though. In those cases, yes I use alt-tab and wordpad (notepad, blah).
You can also usually tell the difference between reports I wrote from memory and those right out of a note file.
My tourney game reports are done the same way, except that I usually have screenshots to jog the memory, or may include a note file for some bits without actually pasting the notes directly in. I have a strong memory. Not infallible, but reliable.
- Sirian