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About Skype: can you give me a link to the skype behaviour?
About iChat/Adium: basic controll of status (online, away, invisible ecc...) - i try with AppleScript but it isn't a good way - and for iChat the possibility to start audio/video chat choosing the contact from a list.
Another good feature it would be the "Clock behaviour", a simply way to show a big digital clock on the screen, with the Remote Buddy style
I think also that a "virtual keyboard" could make Remote Buddy a killer app... but i know this is an utopistic request...
Sebastian