Naming conventions for lots of stored procedures

Hi all;

One of my applications currently has over 60 stored procedures and
future versions will likely have several hundred.  I am wondering what
folks find to be helpful naming conventions for managing a large
number of stored procedures.  We tried using double underscores to
separate module vs procedure names and that just became a mess.  I
have found a few possible separators that might possibly work but they
are aesthetically revolting (_$ for example, like select
test_$echo(1);).

I can't imagine I am the first person to run up against this problem
and would rather ask advice of more experienced folks then to wander
from one maintenance headache into a possibly far worse one.

So, what are approaches each of you have taken in the past?

Best Wishes,
Chris Travers