Show hidden files and folders in Mac OS X Finder

First, open Terminal.

Type this command, then press enter:

defaults write com.apple.finder AppleShowAllFiles TRUE
To allow the files to be shown, you must restart Finder. You can do this by holding the Option key, click and hold the Finder icon. When the context menu shows, select Relaunch.

Finder will now restart.

Now all hidden files are showing!

To hide files again, type:

defaults write com.apple.finder AppleShowAllFiles FALSE
In the terminal instead, and restart Finder.

You can also restart finder by using the following command from the terminal:

killall Finder

Force Ejection of a DVD or CD in Leopard

Make sure you have unmount the disc by right-clicking (ctrl-click) the disc icon and selecting Eject disc.

Restart your computer. As soon as you hear the restart sound, hold the left mouse button down until the disc ejects. You can also use the bar beneath the trackpad and keep it pressed until the disc ejects.

Port forward for a big list of devices

Below you see a list of routers and firewalls. These are the devices that we have written support documents for. These documents provide step-by-step guides on how to setup port forwarding. Our ultimate goal is to have a write up for every hardware router and firewall available and instructions for every application that Internet users have difficulty getting to work through their router or firewall.

http://www.portforward.com/routers.htm