There are some applications that will allow you to do a frame rate transfer from 30 to 24. It's generally a feature only found within some of the elite NLE's. One is Final Cut Pro with their Cinetools, then there's Magic Bullet Suite, and I also think Avid Express Pro might be capable of this too. Otherwise, you'd have to initially acquire in 24P with the DVX100a or XL2, which not too many people have the privilege of shooting on. There might be some more applications out there that I haven't heard of that are able to do the transfer, but as far as Premier, Vegas, or Liquid Edition, I don't think any of them can do it. Only FCP, Magic Bullet, and maybe Avid.