I think it would be useful to append a note section to a workout. After a workout, I like to jot some brief notes (ie pulse, weather, if my legs hurt, reasons I may have changed speed, etc.). I think it would be nice to have a small text box (maybe 1000 characters max) as a piece of the .dat file.
Once you've uploaded your workout to the NST web service you can edit the information to include workout notes. I do this for every workout. Example below:
http://sportstracker.nokia.com/nts/workoutdetail/index.do?id=785133
-David
Current setup: e61 unbranded product code 0529654 Euro-B1 Silver. Firmware: 3.0633.09.04. Theme: Ovi blue. Service provider: 3 Sweden. Peripherals: Bluemax ext BT GPS module
Well, this is true, but sometimes I like to have this information on hand.
Also, occasionally I won't upload to the website for several days, and in the meantime, I run a good chance of forgetting what I would have liked to say. It's much easier for me to write a few notes while stretching at the park than to go home and sit at a computer.
(And yes, writing a separate note using the note program on the phone after stopping my timed workout is possible, but I see no reason these couldn't or shouldn't be integrated.)