I've been working on a "Getting Started" guide and an official examples project. A friend of mine created LINQ to LDAP Demonstrations to help me out since I was slacking and not keeping the samples project up to date. The new examples point to two live OpenLDAP servers (thanks to Stuart Lewis and the University of Texas) so you can actually play around with the framework.
Some of the examples highlight the differences between plain old DirectoryServices and LINQ to LDAP. Not everything works correctly using DirectoryServices (i.e. paging) so I've made the queries pretty basic so everything works across the board. If you know of a publicly accessible AD/AD-LDS server then let me know. You can find the examples here.