If you switched from Windows to Mac as I did. Sometimes it’s difficult to match all the new shortcuts from Mac with the Windows shortcuts. Here are some of the common Mac OS X keyboard shortcuts:
(Command key) – Sometimes called “Apple key”; on Apple keyboards this key also has an Apple logo ()
(Control key)
(Option key) – “Alt” may also appear on this key
(Shift key)
(Caps Lock) – Toggles Caps Lock on or off
fn (Function key) – Located in the lower left corner of …

As many of you already know today (21-June-2010) Apple released iOS4. It has some great features, however iOS4 has some compatibility issues with some programs that I require for work (e.g. Cisco VPN) and others. Here is the list of apps /extensions that do not even run/load, or causes instant safe mode: http://modmyi.com/forums/general-iphone-chat/714270-soon-official-ios-4-0-compatibility-list.html
I tried for some hours and then I decided to downgrade back to iPhone OS 3.1.3 and upgrade when some of those apps are updated for iOS4.  After doing some research on the internet …