Thanks! I switched to Liberation Mono, it's almost as legible as Droid Sans Mono but differentiates the 0 and O.
The link to Proggy Clean redirects to Groupon, it can be downloaded here instead: http://www.dafont.com/proggy-clean.font
The link to Proggy Clean redirects to Groupon, it can be downloaded here instead: http://www.dafont.com/proggy-clean.font