Documentum Archive Services for SharePoint and Documentum Content Services for SharePoint.

EMC has created two products, which, used together, provide a total document management and archival solution: Archive Services for SharePoint and Content Services for SharePoint. Archive Services lets individuals use SharePoint as they normally would, but at some point the process or project is complete and data can be archived. Archive Services lets you move content to a designated Documentum repository to free up resources on your SharePoint server. The other half of the duo, Content Services, lets you browse, search, find, and take action on documents (depending on access controls), without having to leave SharePoint.

There are a lot of solutions out there.  A majority of them focus on creating Web Parts and using them to interact with Documentum.  These are basically using SharePoint as a portal.

harePoint and Documentum should work together using an ECM SOA standard.  A key aspect of this is the ability for the systems to share Authentication and Authorization sources.  This is a problem that everyone faces.

EMC on Content Management for SharePoint
http://www.youtube.com/watch?v=8zT4NsSSa6g
Documentum vs SharePoint – and the need for therapy
http://www.cmswatch.com/Trends/1491-Documentum-vs-SharePoint—and-the-need-for-therapy
Documentum and SharePoint: A Perfect Partnership
http://windowsitpro.com/article/articleid/96162/documentum-and-sharepoint-a-perfect-partnership.html
Documentum vs Sharepoint
http://johnnygee.wordpress.com/2007/05/01/documentum-vs-sharepoint-round-1/
A year later – where is Documentum and Sharepoint today?
http://johnnygee.wordpress.com/2008/03/02/a-year-later-where-is-documentum-and-sharepoint-today
SharePoint and Documentum
http://chucksblog.emc.com/chucks_blog/2007/06/sharepoint-and-.html
SharePoint and Documentum, Patience is a Virtue
http://wordofpie.com/2008/06/12/sharepoint-and-documentum-patience-is-a-virtue/