First of all, as you may see from the video, there is a new USB Linker in the works. This will allow people that have the old Bung carts to use them on their modern computers (without needing a parallel port). It can also interface with official game carts to do things like backup and restore savegame data. If you're interested in this, there's a discussion about it over at the Neo-Geo.com forum.
There is also a related project to create a new Neo Geo Pocket flash cart. You can find a bit more about that on Gerry's Neo Geo Pocket project page.
Finally, if you want to follow some of this progress, check out the developments like Neo Geo Pocket Flash Cart and Neo Geo Pocket USB Linker at Neo Geo Pocket Developments.