A flurry of Tweets a day or so ago re Hack and NetBeans IDE:
John Sirach, from the PiDome project (which won a Duke's Choice Award last year), who started the flurry above and has now introduced the Hack font to the NetBeans community (thanks for that John!), likes this font because it makes code look good even when the font size is small. Here's a screenshot he sent me, with the font size set to 10px:
Here's how it looks for me, I'm using it fulltime now, with font size 18px (nice for teaching and so on), and "Dark Metal" from the "Dark Look and Feel Themes" plugin:
The above is a screenshot that is included in The Complete Guide to Tuning the Appearance of NetBeans.
Get the "Hack" font here: http://sourcefoundry.org/hack/