I was investigating using GMail as online storage space today. It gives 7.2 Gigs of space now! I haven't decided on this or tested anything, but I came across a curious warning on the Gspace FAQ site. It said to be very careful that you put email@example.com not firstname.lastname@example.org if that was your address otherwise your files could potentially be sent to someone else's account!
I was momentarily panicked, thinking about all the mails I had been missing- I use both interchangeably when giving my email address. After a bit of testing (sending emails to both addresses from a different account) it turns out this is absolutely false. Both just work. I remember when I signed up it gave me the @googlemail.com address but @gmail.com does exactly the same in all emailing and logging on options I have found.
Maybe there is some complex situation regarding the specifics of Gspace that I haven't appreciated but in terms of direct access to my mail account the two addresses seem identical. I'm considerably more relaxed now, but I still think I will set up a second account if I do decide to use it as a file server mostly in case uploading activity causes the account to be temporarily blocked.