Jump Desktop (Remote Desktop)Free
Leave your laptop behind. Enjoy the freedom to work from anywhere. *** Supports multitasking on iOS 4.0 and above. Remain connected while you switch to other apps on your iPad, iPhone or iPod Touch ***"Best App for Remote Desktop control"... O'Reilly
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Nimbuzz Messenger Free
Nimbuzz Messenger is a free chat & calling app that helps you connect to your IM & Facebook friends.
Skype Mobile: Call, IM and more on Skype from your Android, Nokia or Sony Ericsson smartphones