The Duke Brief Social Phobia Scale 1 is really an interview-based scale, although it has been converted by John Greist through an interactive voice response, so you could sit at a telephone and do your own rating.
Nothing is published yet.
Marks has done something similar with his fear questionnaire, but these are the only 2 scales tested for their utility as screening instruments. Self-rated scales usually have a good sensitivity but lower specificity. I think we need to use complementary but different approaches. One is whether you can measure improvement induced by a drug. For that, you need a sensitive specific index.