You know the font situation on debian and gnome isn’t terrible in lenny. Actually it looks fairly decent. Until you load icedove (thunderbird).
The fonts are teeny, pixelated and hard to read. Luckily it is a very easy fix.
Open icedove, go to “Edit -> Preference -> Advanced -> Config Editor”
Change the value for “layout.css.dpi” from “-1” to “0”