If you’re near Chicago on 6 July 2011, come to the Chicago Apple User Group, where TidBITS publisher Adam Engst will be speaking about Lion and iCloud, and taking any and all questions from the audience.follow link
Turn Off Filename Extension Warning
In Leopard, Apple fixed an annoying aspect of working with the Finder in Tiger. Previously, if you changed a file's extension, the Finder prompted for confirmation. But since no one has ever accidentally changed a filename extension, Apple thankfully added an option to turn that warning off in the Leopard Finder's preferences. Choose Finder > Preferences, and in the Advanced screen, deselect Show Warning Before Changing an Extension.
Join Adam Engst on July 6th at the Chicago Apple User Group