PerfectMike.Com

Read all about it here: Finer Things in Mac
In Snow Leopard (OS X 10.6+), if you need to open a hidden file, all you need to do is type Cmd-Shift-. (that’s a period) in the standard Open File dialog. All hidden files will be displayed.
This is a toggle, so typing the shortcut a second [...]

Overall, to quote David Pogue, it’s a no brainer. Faster system, you gain back hard drive space, Time Machine continues to work seamlessly for your backups, and it costs about the same lunch does out here in California.