@narciblog asked about better font support in SQL Developer.  It appears I never noticed that Anti-Aliased is not the default.  Here's a screen shot of the default that installs today.

Now, add 2 lines to the sqldeveloper.conf file

AddVMOption -Dawt.useSystemAAFontSettings=on
AddVMOption -Dswing.aatext=true

Then you get a much nicer looking font.

This is probably the quickest and easiest tip I've given so far.