Coinitor

Add in your bitcoin wallet public address (up to 3 wallets can be monitored at once, for example you could have a web based wallet, as well as a more secure cold storage wallet to monitor) and this desktop app simply shows you the balance, the value in a currency of your choice and the number of wallet transactions.

The background bitcoin value barchart shows live data.

This is more secure than logging into your actual wallet to check the balance as it requires no passwords and doesn't need to know your private wallet key. It simply queries the blockchain to access public information about your wallet. In this way keyloggers will not pick up any useful info while you query your wallet.

Requirements:

Java 1.6 or higher