This tutorial has been around for a while, but, still provides the most accurate manual cross-processing effect I've tried for myself.
Of course, I still dig PSP's filter. When are they gonna come out with Lomo?
Speaking of Lomo - I have a trillion rolls of medium format film I need to have developed. I just moved to Arizona, 40 miles north of Phoenix, and don't yet know what exists in the area. Does anyone know of a shop that processes medium format film, and will cross-process?