This was just asked not too long ago here:
http://www.eq2interface.com/forums/s...ead.php?t=8881
The only easy way to do this is to lower your screen resolution. You can change the font size in your chat window and chat bubbles in the game though.
Anything other than that would require changing some or a lot of xml files. If you don't mind poking around yourself you could try some yourself. Most of the text in the game is in the font /TextStyles.Normal.NormalStyle so you could try bumping that up by a point or two. It may break something or cause things to overlap in strange ways though. You can find most of the text styles in the file eq2ui_textstyles.xml and /TextStyles.Normal.NormalStyle is on line 61.