This may be specialized, but the comment form on kayre's journal has really teeny text, way smaller than what I'm seeing while typing this comment using the site style. An entry page says this about the style:

Base style:
[personal profile] timeasmymeasure
Theme:
[personal profile] rising

I'm using Firefox (21 currently), with a couple levels of text-only zoom. I don't have any DW-specific CSS overrides (Stylish).