[NMLUG] How to open source

[paul.tietjens at moriarty.k12.nm.us (Paul Tietjens)]

After years of working with open source software, I feel I may finally 
have something to give back.  The trouble is, I'm not sure how to go 
about it!

I've looked into Sourceforge and of course savannah.gnu.org, but not 
being a super coder I really am not sure what forum these initial 
releases should belong to.

Anyone have any experience with this?  I also, because my projects 
involve other pieces of GPL stuff, have some questions about what format 
they need to be released in.

Specifically, I wrote an autorun script for System Rescue CD, which is 
based on Gentoo, and has scripts for compiling custom-built ISOs.

Am I compelled by the GPL to release all available source code for this 
ISO, or am I covered by the fact that the source is already available 
from the various mother projects?

Probably stupid questions, but hey, I'm not proud!