The major user is Google. If you use Google mail, and you get a lot of mail, your damn led is flashing all the time, and it gets quite irritating.

Speaking of which, I wonder what Nokia gets from Google for favoring it so strongly? I wish someone would hack it so it would notify me when I get Yahoo Mail, which I was using a long time before Google Mail existed, and I don't want to change my ancient email address, even though I also have a Google account.