I used to lock my Windows XP laptop easily with Win+L key combination. When I switched to MacBook I searched for a inbuilt option like that. It wasn't there.
After some searching I found LockTight. Now I use the key combination Shift + Option + Command + L to lock the screen when moving away from the Laptop. Now easier but atleast now I have a way to lock the Macbook.
I was missing the who is typing notifications in my Skype on Mac OS X which is now available as claimed by the new version of Skype 2.8 on Mac OS X.
When I checked where this notification is shown it is visible in the drawer where the participant's names and icons are shown. This means if you want to see who is typing you have to keep the drawer open which chatting in a conference window.