I certainly support it, and I have $100 toward the effort as well.
Perhaps an associated Wiki for each podcast show or series would help listeners organically categorize and identify them? Perhaps a quasi Digg- and/or Amazon ratings-like function could be applied to each episode to allow for podcasts to be simply rated, not just by purely quantitative or link-a-thon means, but via perceived value ratings, both within B2B and entertainment general categories. For example: "This podcast really helped me better understand how to ... in my business. I rate it an 8 out 10 on the business-value scale."
I can also see where an AttentionTrust.org or Gesture Bank approach could be well applied to this open community directory of podcasts to begin to further qualify which types of folks like which types of podcasts. Listeners could voluntarily provide their even most basic use-and-interests meta data, which could provide a beginning of open metrics for assessing and defining affinity groups or channels of interest within larger podcasts groupings. Such meager metrics would really help in applying sponsorships to podcasts, and prompt more content creators to rely on the open directory primarily.
Ya, let's get going. Go, Dave, go.