I made a transaction two days ago, but blockexplorer.com doesn't show the recipient address.
Also there are zero confirmations yet and I start wondering if something went wrong.
2 days and my transaction does not show up in a block. Also I'm not able to resend the coins to give it another try.
Bitcoin Charts is a great place to check and see if your transaction is out there. It displays unconfirmed transactions that have been broadcast to the network. If a transaction does not show there, then running bitcoin with the -rescan option should fix things up.