How Do I Increase The System Font Size In OS X Lion?
There currently isn't a way to adjust the system wide font in OS X. The closet solution is to go to System Preferences > Displays and decrease your screen resolution. This is by no means a perfect solution. You can also increase font sizes on a per app basis in my applications. For instance, in Safari you can go to View > Zoom In (Command +) to increase the size of everything.