Generally, if you post a thread along the lines of, "I'm going to be wriing such and such feature", or "I need to make the following hack", then if it's been done before and people know about it, they can direct you to the relevant thread where there's more info and/or a patch.
I don't know about other projects, but the NZVLE project has a public arch repository, http://lists.eduforge.org/cgi-bin/archzoom.cgi/arch-eduforge@catalyst.net.nz--2004?expand where you can browse all our customisations.
If you're versed in arch, you can register http://nzvle.eduforge.org/arch-mirror
And as MD says, you can look in contrib too.
-- Penny
General developer forum
Repository area for code snippets and hacks
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