I have to agree with most everyone else. You're out of luck. I doubt the police would even bother to get involved for something this small, even though I know its a huge issue for you. The sad fact is that this just isn't even close to important enough for them to expend resources on, just to get something returned to you that holds no quantifiable dollar value. All you lost was a free email addy, your email contacts, and old emails. I know that sounds a bit harsh, but realistically it's simply not worth the polices efforts.
And, as someone who takes his security seriously, I doubt he "hacked" your account. More than likely he simply guessed your password (sadly, most people use very weak passwords still), or you left yourself signed in when you used your email, and forgot to clear out your password.
You also need to accept the very real possibility that he's deleted all your contacts and emails and is simply keeping the account active to drive you insane. If he let it go inactive and be deleted, then you would be given some closure knowing that it was lost forever. But, this way he gets to see you squirm, knowing that you still see a chance to get your info back, even if he knows it's gone forever.
My advice is to simply move on and accept the lost of the account, and all the info it contained, as a valuable lesson in security and pledge not to make the same mistake again. I know it's a painful lesson, but those typically tend to be the ones we take to heart the fastest.
PS. a good password should NEVER EVER be a word, or anything resembling a word. It should contain numbers, letters (upper and lower case), and symbols like $&@ and such. There are more than a few free programs out there that'll generate strong passwords for you that are impossible to guess and hard to crack. There are also password managers (such as roboform) that'll save passwords for you for various sites.
Edited by Brafu, 27 July 2009 - 10:59 AM.