Sorry guys, I'm real newbie But the question is sensible I think...
Yes, that is definitely a sensible question. Here's a similar question and answer from the FAQ:
A.) Bitcoins aren't actually "sent" to your wallet, the software only uses that term so that we can use the currency without having to learn new concepts. Your wallet is only needed when you wish to spend coins that you've received.
The coins that were sent to you when the client was not running will later appear as if they were received in your wallet when you later launch the client. It will download blocks and catch up with any transactions it didn't already have.
- http://en.bitcoin.it/wiki/FAQ#What_happens_when_someone_sends_me_a_bitcoin_but_my_computer_is_powered_off.3F