Does this break the links, or just stops them from being cleaned up? (if the latter, I wouldn't call it a bug, although I'll try to look into it for next release)

No, it doesn't break the links but it will force the pages to display in English instead of in the user-selected language.

Sure, but those can be all fixed via a bot or a script later. Anyway, will look into it.

Should be a no-brainer anyway ;o)

Ok, that mini-thing has been changed. Not sure if the stuff after the ID should be removed, but it seems it wasn't touched before. Opinion?

Edit: the link does work without it, but it redirects to the full URL anyway - which is why I am wondering what's better.

Ahh, I haven't realized that this part can also be omitted.

However, before the URL scheme change this stuff wasn't there. URLs were like http://www.jamendo.com/en/album/81403 (which BTW still works).
I just checked a recently downloaded MP3 file and they still have that old URL in the WWWAUDIOSOURCE tags.

Not sure if artists can or will ever change release titles but if they do then only the URL without the title is stable. Therefore my +0.1 for removing it.

http://codereview.musicbrainz.org/r/1937/