American Social History Online portal is the first of four ways for scholars to get access to a range of digital collections from various research libraries. By using Firefox, the portal is integrated with Zotero citation management software. Please check it out! Report bugs or request features using the SourceForge link on the site.
Coming soon... Sakai integration, a federated search solution and improved retrieval of collection by commercial search services such as Google and Yahoo through search engine optimization. Aquifer provides this so individual libraries don't have to.
Information on how to contribute is available on the Aquifer wiki.