I have implemented a new way to display numbers in all the program
listings on my website. It is most obvious how it works at
http://mindprod.com/projects/scid.html

I use color to group the digits in threes (or fours for hex).  I also
use a different colour for the lead and trail decorations such as
0x 0 - and trailing letters fF dD lL

I have three colour to play with,
1. for decorations not part of the number proper
2. for odd numbered groups of 3
3. for even numbered groups of 3.

I fiddled with them for a long time and settled on three shades of red
so the teffect is subtle, but still noticeable.  However, there is
complication other than my personal taste. The red colour gun is flaky
on my monitor, so I am not seeing accurate colours.  

IF you would like to look and suggest the what you think would be
better colour numbers, and ideally form a consensus I would much
appreciate it. They eyes you save may be your own.
.