How many unspent transaction outputs are there?

I was wondering the other day how many unspent transaction outputs there are ?

If you just keep track of the unspent transaction outputs you could import private keys, know its balance and perform spends. How much data is this compared to the full blockchain ?

The biggest downside is that you would not have the full transaction list for a private key/address – just the transactions that you can use for future transaction inputs.

Which exchanges are Tor-friendly?

Mt. Gox’s sign-up page states:

Please be advised that accessing your account via the Tor network
and/or public proxies may result in a temporary suspension of your
account, and having to submit AML documents.

Are there other exchanges which do not have such a restriction (e.g. for transfers and account balances below $1K USD for instance?)