Which font makes it easy?
I'm quite fond of Vera Sans Mono and I like Andale Mono. Both are nice sans serif fixed-width fonts, much nicer than Courier.
Vera Sans looks gorgeous, except that maybe the minus glyph is slightly too discrete.
And I'm not mad about the zero glyph in Andale. It has a horizontal bar running through it, to make it easy to distinguish it from the uppercase O glyph. I bar my zeros when I put pen to paper (when writing code longhand) but I find it annoying in a screen font). But the parens and curlies are very easy to distinguish, choose your poison.
But both are definite improvements on Courier and Lucida Console.
- another intruder with the mooring of the heat of the Perl