I saw this thread and felt compelled to respond, as I'm in the same boat.
Open Terminal and use the following command:
defaults write NSGlobalDomain AppleDisplayScaleFactor 1.5
You can choose whichever scale factor you'd like. 1.5 works for me. This is likely similar to what someone else mentioned, but there's no blurriness. I think they used "-g" instead of NSGlobalDomain, which may have had a different effect?
I have bad vision and I'm working on a 25" monitor. When I got this system and saw the size of everything, I thought I'd have to return it, but this has worked for me very well.
Note that there are some graphical artifacts - I just live with them, personally. Additionally, certain programs may not tolerate scaling very well, and positioning for a lot of popup items and menus is currently broken (if you hover over an object, the popup will appear in a different location due to broken positioning; this breaks some applications). However, this makes the system usable, at least for the scale factor that I currently use. Going over a certain factor may cause problems.
Also note that the Dock doesn't actually resize - at least, not graphically. Hovering over the Dock will reveal that although it hasn't gotten bigger, its space has changed - the popups will appear in the wrong places. To fix this, I manually set the Dock to use a scale factor of one using the following command:
defaults write com.apple.dock AppleDisplayScaleFactor 1
And voila, the popup menus are fixed. You can set the scale factor per application using this command, if you know the application's callname, which will fix any problems you may encounter with specific apps that don't play well with scaling. (The application plist files are in the Library/Preferences directory of your home drive; find the name of the application you're looking for and follow the command convention above.) It's pretty useful. Don't forget to use sudo - it's necessary for this, if I remember correctly, but these changes will only take place for your user account (...if I remember correctly).
This has worked for me and I'm pretty happy. Best of luck, guys - and remember, if you break it, you can always run the command again and set the scale factor to one.
Message was edited by: lunchmeat317