Sending and receiving address What's the difference between sending and receiving address? I mean, if for mistake I asked to send a payment to my sending address, have I lost my bitcoin? TX
Addresses can both be used both for sending and receiving transactions. However, some online wallet services share addresses between different users, so you want to be careful if you are using one of those. Use a "receive payment function" or "my address", or whatever it might be called, to get the address that can receive payments for you.

If you are using the standard client, all your addresses are fully under your control and are safe to receive transactions.