Sony really needs to strike a deal with Blockbuster to carry UMD-format movies for its new PlayStation Portable (PSP) system. I suspect very few people will be willing to shell out $20-30 for movies they can only watch on a 4-inch screen--especially if they already own the DVDs. Ah, but a week-long rental for $3.99? That would make all the difference. Let's see if Sony can figure out this obvious move and really help usher in the area of "personal video."