Dude, you done saved my ass from having to find it all again, thanks so much!
Here are some you missed, and extra thanks for elaborating on some of them as well!
pachd.com has some music too, and it's actually not bad.
soundeffectsplus.com appears broken when you download but the actual download pops up at the bottom of the page silently.
gamesounds.xyz has the elusive first game audio bundle hosted.

en.soundeffect-lab.info
Professionally done anime and highly processed sword sounds, with very loose licensing.
bbcsfx.acropolis.org.uk
Research and education only, but some seriously amazing recordings here, particularly the ambience.

opsound.org
Obnoxiously  new age and up it's own ass, but also seriously great music and all covered under the same CC license, with useful tags and genre links.
teknoaxe.com
Big selection, particularly of electronic genres. The site navigation is a bit, odd, but you'll figure it out pretty quick LOL.
soundclick.com/business/license_list.cfm?
Change the license type to creative commons in the combo box and suddenly you have a large selection of high quality music open up. Awesome!
soundofpicture.com
it's all free! as long as it's non commercial, and he has a stricter definition of commercial than most, so just read the FAQ, and keep in mind that the full library download doesn't include the following albums for what ever reason, so you'll have to grab them separately. (Bright_Corners, Passages, Piano_II, Piano_III, and Soul)
And yes, it almost all does do that same repeating melody throughout, if you listen to a bunch of tracks you'll know what I mean, it's enough to make you think your going insane! Despite that the music is really good.
kongano.com
At first it seems like it isn't free, but read the FAQ and you'll discover that it is, which is great because their is a ton of stuff here in multiple categories. And even though the accessibility of the site is a bit meh, the descriptions for the tracks are great!
audionautix.com
Large amount of music in multiple categories! Though if this is the same guy on freesound, than I'm curious why he doesn't also have his sounds up their?
twinmusicom.org/portfolio
Good variety here, including some 8bit.
joshwoodward.com
Heavy on the guitar :-) but I'm not complaining.
timbeek.com
Only a few songs, mostly orchestral, some really high quality stuff, and he's got a youtube channel too.
youtube.com/user/holfix
Only a few tracks but very good, all orchestral, the link to the archive is in the descriptions of the videos along with the license. I admit it's a bit iffy from a legal standpoint, but I really doubt he'd give you any trouble anyway, and at least he's got some sort of  guidelines, even if it's not that official looking.

ccmixter.org
I hear about this site all the time, but it's really complex looking and I need an account, I just keep not bothering, does anyone know more about it? because it seems really good. Kinda like a freesound.org for music...

Now all we need is for someone to organize these into simple categories with some tags/notes, music samples, full music tracks, sound effects regular and mostly synthetic, large downloadable libs or searchable single download sites, account or no account needed, ETC.
After that, if someone is willing, and this would be a bit agonizing but hey, it would be helpful to many people if you spread it around allot, but if someone would organize them based on general quality/selection as well, than that would make it even better.

So I was poking around in "producerspot.com/free-downloads" and their is at least one sample pack on each page it seems. Plus, it's not just for music, any atmospheric drone/pulse, cinematic sound like stingers, risers and stabs, obstacle impact sound, or UI element you need can be found/adapted from their.
All the uses I listed above are universal with any music sample pack, especially the natural less synth heavy ones like 99 sounds garage Foley and the warehouse for instance.
It's true their hit and miss sometimes, like hexloops horrific Halloween, but you can find gems in each one, and with a bit of basic cleanup others can be saved.

One more that I used for a project or two.
http://soundbible.com/
Some free sounds and stuff. Pay attention to licenses as usual.

thanks magurp: very good archive

Hi,

@defender, feel free to take this on at your convenience. As you can see, I can't come to the forum as frequently as I'd like. I'd be happy to continue to contribute to the list. I'm just glad a few people are interested enough to have committed a few sites to the list. We just have to decide where this list will be hosted. I probably won't have time on my hands until the winter holidays in the Americas. So, until then, if nothing gets done, I'll be happy to do it myself.