If you want b/w slides/transparencies the obvious option is to use Agfa's Scala film which produces very nice results. However, there's another option I came across by chance just today. Through a process called "dr5" David Wood managed to turn regular b/w film into transparencies. Check out this fairly enthusiastic article about it. Information about the process, how to treat the films and how to reachthe lab can be found under dr5.com. I'll definitely want to test this process with Kodak's (very low-speed) Technical Pan film (for which I couldn't find a decent link).
