Brigette over at the Longmont Examiner gave me a heads-up on this about two months ago, and I'm glad to see that it's up and running:
The City has announced that the Longmont Museum's photo collection is now online and searchable. Check it out here. This will be a great resource for anyone interested in the history of Longmont and our surrounding area.
I see the commercial use fees but can't really determine if amateur hacks like myself are allowed to display photos from the archive on our non-commercial websites (with proper photo credits, of course). I do notice that all photos from the archive are displayed with a "Longmont Museuem" watermark.