And they're not happening in Manitoba.
I won't go into detail again about what I consider to be the piss-poor state of Manitoba's online heritage presence, if you want to know more about my opinion check out my post The state of Manitoba's online heritage resources.
Library and Archives Canada has bypassed the government website route and went straight to the people, so to speak. Last year they began uploading their massive collection to a Flickr album and created a blog to give tips and suggestions about finding information in their collection. Great stuff and both sites continue to be updated regularly.
Also, the New York City Municipal Archives has uploaded almost a million !!! images to their website. It's really worth checking out for any urban history buff !