What fun seeing this topic beat to death again. Try Googling newsgroups on this subject and see the hits you'll get!
Personally, I never ask the Flight Attendant if I can or can't. I just chose a window seat (whenever possible), and tuck my BC296D by my side, with a discreet ear bud for audio. Air Canada, BTW, has lengthy instructions on the use of electronic devices in flight. If my memory serves:
1. No use of cell phones after the seatbelt light has been turned on prior to take-off, in flight, or until the seatbelt light has been turned off on arriving at the terminal.
2. Laptops or PDA's with wireless devices must have them turned off at all times.
3. "At no time may peripheral devices such as printers be used."
4. "To use any other device, please consult your flight attendant." IMHO, why bother them; they're busy enough as it is
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)