Liberation font family comes with Liberation Mono, which has very distinguishable 1, l, and I. It also has a little more line space than Lucida Console, so it reads with more air.

For matching document text, there is Liberation Sans. The only problem I have with that is that there is still some strange kerning issues, but at least it is freely available for both *nix and M$Winblows, so all documents look the same. And it reads perfect for headings as well as for long running text. I now also use it for all fonts in my browser (yes, "serif" is mapped to "Liberation Sans")

With these fonts, I see no excuse left to stick to any serif font, except maybe for the occasional header in some glossy advertisement nobody wants to read anyway.