Other talk about Salix
I would start there, the live cd's are a bit older but it should give you an idea. You could also try Slackels livecd since it should have a newer kernel being based on Slackware current and Salix. Slackware also has a live cd thanks to Eric (alienbob).
Try different fonts in different sizes. I use "Luxi Sans" 9 as title font and "Sans" 8 for the text on a small, 11-year-old netbook with a screen of 1024x600. Also, try to disable anti-aliasing in the settings somewhere. Couldn't be sharper.