Hadn’t seen this blogged yet anywhere I read, so I’ll cite it, even though I know some people are annoyed by just pointing to existing resources in your blog.
Has some good practical advice for attempting to integrate institutional repository and ‘e-print/pre-print’ content into your link resolver.
Shigeki Sugita et al.
Linking Service to Open Access Repositories
Volume 13 Number 3/4 ISSN 1082-9873