I'm using gLabels to create some small pieces of paper to give away to people - Just two lines of about 15-20 characters each. One of the important parts of the design is that there are no "o" ("oh") characters, but there are "0" ("zero") characters in an all-lowercase URL. Therefore I need a non-monospaced (and very legible in print) font where "0" cannot be confused with "o" even without reference.
The closest thing I've found so far is Andale Mono 
and Inconsolata 
, but they are both monospace, and as such not very easy to read in print.
Alternatively, to find a font myself, is there some way to preview all fonts in the Ubuntu repositories without installing them?
It will take some work sorting through different fonts, but Google Fonts are free and can be easily downloaded to your computer. It's an easy way to browse, and you can type specific characters to display.
Based on @Sergey's comment, I created a free, readable subdomain URL forward at afraid.org.