Registration Details
Another point to new or existing users - providing an email address when you register, or updating your profile at a later date with a new address.
If you forget your password you can have a reminder sent to your registered address. Without a registered address, you can still get a password reminder (in some number of days) PMed to you on Flyertalk if you register a calendar handle the same as your FT handle.
Note that there is no point submitting a request for a password reset if you have neither provided an email address nor used a handle the same as FT. You may laugh, but people do do this!
Another advantage (coming soon-ish) will be an opt-in email alerting function to tell you when you're passing near to other calendar users. Obviously you cannot use this at all without a registered email address!
I'm sure calendar users will vouch for the fact they've never been spammed as a result of recording their email address in the calendar.