Mobileread has something like this in their Calibre forum. People post their plug-ins with a short description of what it does.
It would be nice to have a library of working scripts so people won't keep re-inventing the wheel.

not sure if there is a colection of scripts out there, but http://www.creationkit.com/Category:Papyrus do hold a great deal of it, and many scripts are build of those. Its a matter of understanding the language and figuring out where to fill in what you need it to do

One of the best sources of scripts is published mods. Or at least that was true for all of the previous Elder Scrolls and Fallout games. When mod creators include the source files in their mods like they should you have plenty of real-world examples to use. Unfortunately a number of Skyrim modders seem to prefer keeping their scripts "secret" by not including the psc files. That was fine back in the very first days of Skyrim modding when the crazy people couldn't wait for the CK and were creating the .pex files by hand, but people really should be including the .psc files for all new mods.

Keep them secret? Haha, who would want that? I mean, sure, if your mod contains a 7000 line script that you spent 4 months writing, I could understand keeping that secret. But if your mod contains a large amount of 1-30 line scripts for doing things around, why? I plan on including my source files when Falskaar is released. I just have to remember to include them!

The wiki has a http://www.creationkit.com/Complete_Example_Scripts page, and TESAlliance has a http://tesalliance.org/forums/index.php?/forum/132-skyrim-script-repository/. Either of those are probably similar to what you're looking for.

Cipscis

I'm pretty sure PSCs are automatically packed in BSAs now (v1.6.89+) which wasn't formerly the case. It might not be that modders had intentionally excluded their PSCs, but that they were just previously not included w/o manual dragondrop.

Oh jeeze. I still need to figure out the whole BSA thing. I heard a lot of bad things about it a while back and now I'm scared.

Just look closely at what's included by default and dragondrop anything that isn't automatically included. The problems I've encountered, like alias scripts not being included, have been fixed.

That becomes rather difficult when between LOD, voice, scripts, and facegen data, there's over like 5000-8000 files that need to make it in... xD

EDIT: Oh hey, the packer totally didn't work before but now it seems too. I'm gonna try it out.

DOUBLE EDIT: It crashes when I try to pack my 5000+ files into a BSA. T.T

Yep a lot of mods have their sources included and bsa does include sources by default when they are made through the CK

But, yes, unfortunately some people dont want to show their sources. Even If you ask.

Anyway, I have one rules for myself: never run those mods.
I want to check if the scripts are safe and if the coder knows what he is doing. I got too many troubles with some badly coded scripts.
Skyrim is a very open game, we can change anything, I dont see one single reason for a mod to be closed.

It is possible, by hand, to convert a disassembled *.pas file back into a *.psc file that will be close to the original, but it's also quite difficult. I don't really see any good reason for mod authors not to make their source available either. Personally, I make a point not only of making my source available, but also noting that anyone can use anything they find in there without needing to contact me about it or provide credit. Looking at others' source is a great way to learn - it's how I originally learned to script back with Oblivion.

Cipscis

I not only publish my scripts for my hunting mod, I openly state in my mod description that I do and the reason why.

A lot of my scripts a short. But I have a good amount of longer scripts for quests that deal with variables, and the fetch style quests. I want to share how I built these quests, so people can not only learn from what I've done, but improve on it.

Maybe I'm alone in this thinking, maybe I'm not, but I see it as we're (us modders) all in this together

I agree with that. Now, if people copy my story, or dialogue files, etc; I have a problem with that. But if people want to learn from and read my scripts, even copy+paste them for their own mods, I have absolutely no issues with that whatsoever.