Public Service/Custom Service

We are trying to extract content from a sitefinity site (list of content) via a service to display in a separate web application that is not sitefinity.  What we are running into is the sitefinity service requires credentials to be passed in to access the data in sitefinity.  If multiple requests come in at the same time the first request gets through, but the next request is blocked since the same credentials can't be used at the same time or the first one hasn't logged out.  Is there a way to expose a service in an anonymous way or a way to create a custom service in sitefinity that allows anonymous access?

Justin,