What decade are you in? Do you actually have "subpixel smoothing" turned on, on your expensive flatscreen monitor? (It's not on by default, incomprehensibly.) My LCD monitor claims to have 1680x1050 pixels, and the glyphs on it look perfectly sharp. Of course with the wrong font it looks awful, but I've found the fix for that, noted above. Before Linux Libertine I used Vera, and Century Schoolbook before that. I was never satisfied until now.