I started today to find the simplest way to make my Eclipse look better on Ubuntu. I've got a laptop (so, I'm used to work with an LCD screen). Here is my solution :
Step 1 : install the ttf-liberation package
Step 2 : open your system->preferences->apparence menu. Go to the font tab and change fonts like that :
Application/Document/Desktop font: Liberation Sans, size 9
Window title font: Liberation Sans Bold, size 10
Fixed with font: Liberation Mono, 10
Select the LCD screen optimization features (including in the User Details options).