I've actually gone ahead and created an account just so i can try and end this...
JDigital, it seems you don't know how cameras record images, so i'll explain:
First, the shutter is closed, the shutter is then opened for a certain amount of time to let light hit the sensor that's recording the image, then the shutter closes again and the image is stored.
In a video camera at 24fps, this sequence happens 24 times in a second (go figure), but because movement occurs during the time the shutter is open, the image is blurred, this is hugely important; because every single image is ever so slightly blurred, the motion SHOULD seem perfectly fluid (obviously, there are certain times where it is indeed slightly too slow, because you can see small stutters in very fast moving images), this is because this is exactly how our eyes see things - the world blurs at high speed, therefore it seems natural to us because our brains take this into account when viewing it.
In a game, a graphics card sending out a still shot (this is how they work) once every 30th of a second would seem, to us humans, a LOT more noticably slower than 24fps cinema. This is simply because the game "skips" from one frame to the next with no blurring inbetween; this is strikingly obvious to our brains (and they don't like it).
Interestingly, as someone mentioned a while back, TDU seems fluid at relatively low frame rates... You know why that is? It's got blur
Game makers can incorporate blur as a post-process in games (there are only a few games that do this - Crysis is another that does) which makes them appear more fluid at lower frame-rates as our brains like it more that way - problem is, the PSP can't manage that all too well...
Now, onto you asking for anti-aliasing; don't quote me on this, but i do believe the PSP can't physically utilise anti-aliasing. Even if it can, the performance hit of even a little anti-aliasing would be very large, so, more likely than not this is unfeasible too.
If you're sat there thinking "hmm, but some PSP games look like they have anti-aliasing", more likely than not they're 2D and therefore rendered differently (not having anti-aliasing) - if you could point out any 3D game that has anti-aliasing on the PSP i'd be pleasantly surprised, so that's a nice little challenge for you