Well, I didn't use Past Perfect but we have just launched our collections online using the open-source option called
Collective Access. You can see the front-end result here:
GVSU Online Art Collection.
What you don't see there is the administrative interface. The system is very customizable and powerful. However, it does take someone with a technological background (php, css, mysql, etc.) to successfully install and use it.
For museums, and other non-profits, it's now possible to have an online collection and full collection management system for FREE. Collective Access is open-source (free) and web servers such as
Dreamhost offer free hosting for non-profits.