I'd really like to get something like how LibraryThing handles multiple collections, which is pretty similar to what you suggest. Probably won't make it for NGS though

> Probably won't make it for NGS though

You're even not allowed to work on this for NGS, there's more important things to work on
That's why I've set the target version "Post NGS Release" when I've created this ticket.

Decided by http://scheduling.ocharles.org.uk/results and http://chatlogs.musicbrainz.org/musicbrainz-devel/2011/2011-12/2011-12-05.html

I'm going to attack this by replacing the list in the sidebar with 2 options:

Collections of mine that this is in

• this has an option to remove the release from a collection by clicking the remove option

Add to collection

• has a dropdown of all collections and an add button
• also, a text box to add a new collection and automatically add this release (MBS-4872)

(the remaining item, how many collections is this in globally, will stay)

I'm going to use the popup box like the "Relate to..." link in the sidebar - the one that pops up where the mouse is clicked. It does mean 4 clicks to add a new release now - click for popup, 2 click to select a release, click add - compared to the 1 currently.
Ideas for other ways of presenting this box, or for alternatives would be appreciated. I'm not too keen on sending people to another page to do this.