I like that feature ... and I also use Evernote for BB which allows me to sync the voice memo with my Evernote account and have it waiting for me when I get to my PC. Also nice for photo reminders, text notes, etc.
My favorite BB / Evernote use? Remembering where I parked my car in the airport lot before a trip! Feels good to come back seven days later and have an exact photo of where I put the darn thing.