ARN is the biggest no-kill cat shelter in Montreal and is entirely run by volunteers. Unfortunately, the building they were renting changed owners and the rent has been upped 33%, making it no longer affordable. They are currently looking to relocate their 300 cats, which is not an easy feat, let alone a cheap one. You can help by voting here (please do! daily!): http://www.avivacommunityfund.org/ideas/acf13377
I swear I did not register just to post this, though I must admit it was an added motivation (I've been lurking for quite a while).