Just completed last week a purchase of a 160 point add-on for BLT on-site at DL. I received the following incentives:
1. $112 purchase price less $5 Discount
2. 160 Developer Points
3. 2 Premier Annual Pass vouchers (no expiration at WDW)
4. Allowed to split the 160 points into 3 separate contracts of 60, 60 & 40.
5. Founding Member Status for VGC (exclusive right to purchase VGC from 1/25 - 3/25/09 prior to sale to non-founding members)
As far as I know this deal was only available if you made your purchase at DL. You had to purchase a minimum of 160 to get the 2 annual pass vouchers.
I believe that the same deal is still available except that you would not be able to split up your contract due to the minimum 100 point limitation now in effect.
Since I live close to DL and am able to use the 160 Developer Points at the 3 DL hotels (that I never wanted to pay rack rate to stay at) this was a very attractive deal for me. I am also considering a purchase a 100 point contract at VGC.