Microsoft has released Skype 6.3, a maintenance release to the Internet telephony app with a smattering of new features. The update adds a slideshow view that displays other participants when you are the current speaker in a group call (including group calls when someone else is screen sharing). It also adds an in-call dial pad for generating DTMF (dual-tone multi-frequency) tones, which is displayed after pressing the dial pad in the call toolbar while you’re on a call with a phone number. The release also brings several improvements, including the capability to sign into Skype when using Ecamm’s Call Recorder software and optimized preference menus for Danish, Italian, Japanese, and Korean localizations. (Free, 37.5 MB, release notes)
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Multi-Monitor iChat in Snow Leopard
In Snow Leopard, on a multiple-monitor system where you're using screen sharing over iChat, dragging the tiny inset preview of your own screen to another monitor shifts the remote screen to that monitor.