Snow Leopard – Running on Core Duo

You could try the update to 10.6.1. There is no mention of fixes to wireless but I think I read somewhere that minor networking updates were made.

If this happens to you when your iTunes window is actually open, just not the foreground application, you may have something else going on, it sounds like an issue with expose or something (which I believe is what command-tabbing to applications is handled by). Try trashing your dock plist and see if that does anything for you.

From what I have found, it depends on how you have hidden the window. Command-tabbing to an application that you have hidden using command-h should cause the window to come up. However, if you command tab to a window you have closed (either by hitting command-w or the red x), the window will not show upon command-tabbing to it. If you always hide iTunes with command-h I think you will be alright.

I think, that if it is a "feature" rather then a bug, the logic would be because the window was closed, so there is really no existing window to display. On the other hand, if a window was hidden, there is still content to display it is just hidden from view.