The recommended way to use bitcoin is by creating a new address for each receipt.
Hmm yeah you're right, the current GUI doesn't really help in the recommended workflow (and that's what a GUI should do). Maybe add "New receiving address", "Your receiving addresses" to the toolbar and drop the address from the main screen then.
Wouldn't a combo become too big eventually? Anyway, if it is easy to filter by the address label I suppose that's not a problem.
Good point...
edit: so, what workflow would you propose?
User wants to receive coins from someone.
1. He clicks "New address"
2. He enters label for address and presses enter/confirms
3. A window appears from which the new address that can be copied to the clipboard/Drap and dropped.
He is reminded that the address can be found in the 'Received addresses' list later.
Something like that?