A quick tip for all the fellow OS X users. It looks like OS X Leopard and Snow Leopard have problems with automatically turning on sub-pixel rendering for fonts when viewing text on external display. This means that your new huge display will show things differently from your built-in one.
After getting bit by this, I’ve discovered a simple fix in Apple support forums:
Open Terminal and enter the following command:
defaults -currentHost write -globalDomain AppleFontSmoothing -int 2
and then log out and back in.
Check the thread for more commands.