A bit about methodology....
When determining whether or not a resource is "related to the humanities or social sciences", there is a small amount of gray area. For example, the content and mission statements of resources such as digital libraries will generally present a leaning toward humanities or sciences; if no trend is apparent, I have included the resource with a note regarding its ambiguity.
The date of "Last Update" is crucial in determining the value of an online resource. When this information was not presented on a site's main page, I have used its internal pages (often the "News" or "Current Projects" pages) or its page source to determine when the site was last updated.