Here are some random post about the PSP on another forum all put together:

Post 1:
If you're not sure about getting a PSP or just want more information on it, then look no further than here.

This place will show you exactly how great the PSP is. And it'll definetly make some PSP buyers out of DS Fandoys.

Note: The list of launch titles are inacucrate, as that is the launch titles of Japan. When it hits America and Europe (Europe, also meaning Australia and New Zealand) there will be much more launch titles. For instance, Wip3out will be released on launch date over here since it is developed in London studios and is not japanese made.

Post 2:
Here in Australia the DS is $199 (Confirmed). The PSP alone will be $250 and $300 for a value pack containg a Soft Case & Hand Strap, Headphones With Remote Control, Battery Pack, AC Adapter, 32MB Memory Stick Duo and a Sony PlayStation Portable. (No confirmed, but expected price). Oh, they're now makin g 1 GB memory sticks for the PSP. And as the PSP can play MPEG4 movies, you could download a couple Simpsons/Futurama/Family Guy/Lost episodes on your PSP. Awesome
Aswell as that from my other post, you can download music, maps and stuff like that for games as add-ons (Just like what you can do with X-box Live):

Q: Are you going to include any downloadables that can be used to enhance the title at a later date?

Berry: Absolutely, this is a big part of what we have planned for the game, and is one reason why the team has grown to a large size. Players are going to be able to download new tracks to race, new ships, new skins for the front end and new music tracks as well. This is a feature that is unique in the PSP and allows for a new delivery method for content, adding extra value after launch for its titles.
Also, you can play two player wireless on two different PSP's with only one user needing the game. Liek for instance, with pokemon on GB, you both need a copy of the game, but on PSP, only one user needs a copy and you can both play two player. Recent games that allow this are Ridge Racer (PSP).

EDIT: You can also hook up you're PSP to a tv using some form of Video Outs (Probably not Yellow, White, Red Av outs). Sony are already planning to make smaller PSP's just like the PS2's slimline and the PSone. Whith this, they might even improve a few things for the smaller PSP, like longer battery life.

Post 3:
I saw the DS the other day and it looked awful. It looks like it's made out of cheap plastic material. I was thinking about getting a GC, but seeing that DS the other day just showed me how Nintendo are going downhill. And no, I will not be getting a Nintendo 5 anymore, I shall be getting an PS3 or Xbox2 depending on which one is cheaper at launch.

I've started saving up for my PSP awell as selling one of my PS2's. I shall pre-order it once I have $300. And by the time of release (march) I shall have $500 on pre-order. So I can buy a few games, too. :P (PSP games are expected to sell for $50-$70 AUD).