I currently have separate logins for COL, Missionary applications, Ward Web sites, LDS Catalog, Tech Forums, etc. A couple of them are the same, or I may have the same login name, but there are still at least 3 different accounts. It would appear that the Church is trying to change this. There is a recent addition to the site called LDS Account that provides a “main sign-on account for many online LDS Church resources, such as www.beta.lds.org, www.ldsces.org and LDS Art Competition.” Hopefully this morphs into a single sign-on for all Church sites.
Note: I’ve updated the Official web sites of The Church of Jesus Christ of Latter-day Saints page with this new sub-section.