1. Yuckie-chan's list of pretty much every Arashi subbed file ever, although this is the new list that's actually maintained by several people. If it's not here, it's not subbed, seriously. Requesting subs for something not on this list is 99% likely to be in vain (and will probably annoy people).
2. Arashi live performance archive. This list is amazing! It has, as far as I know, every Arashi live performance all in this one post, from pre-debut (!) until now. I don't think as many people know about this as about Yuckie-chan's list.
3. There's also this general JE subbed video index which is probably less complete than Yuckie-chan's list, but I dunno, it's good to have this link too? ^_^;;
4. last_of_days is the best source in Arashi fandom for raw videos, especially current ones. If it's not here, it's not on LJ.
5. The Arashidex, thanks to yuri_senritsu! I've never seen this one before, but it has some pretty cool stuff, especially for new fans.
6. Arashi fansub video project list, so you can see which subbing groups are currently working on which videos. Thanks to sella90 for this one!
7. Arashian's archive site, which is no longer updated and many of you know the main site no longer works, so there's nothing recent, but it's probably the best resource out there for old raw files. Thanks to eririna for reminding me! Also, she tells me that gyakukaiten is a good place for old raw files.
I hope these links can be helpful to some people who might not have known about them before! If there are any other links you guys think I should add to this list, let me know and I'll add them in!