Well, it all depends on what specifically you're looking for. In Debian, the "official" repositories have groups main, non-free, and contrib (and maybe non-US, I forget). Anything outside of that is not supported by the distribution (i.e. Joe Blow has setup a repository of things he compiled into packages which you can use at your own risk). Occasionally to make your life easier you might use one of these (like debian-multimedia.org for mplayer and codecs, etc), but you might get into some conflicts later on if the official repositories include things.
I think Ubuntu has a few "Official" but unsupported repositories like multiverse and universe.
Anyway, the best way to find unofficial repositories is to google for "program Debian repository" (or Ubuntu,FC6,Suse,etc) and see what comes up.
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