I'm planning to purchase a new PSP within the next day or so (depending on what you all have to say about it).  I'm looking forward to playing some of the games the PSP has to offer, but I want to take full advantage of the PSP's functionality:  music, pictures, movies, and web browsing.

What software upgrades (firmware?) and add-on's would you recommend to make it a top-notch portable media center?  What are your thoughts on Sony's Media Manager?

Where are all the UMD movies... LOL?

What are some of the "must-have" games available now and coming soon?

What accessories are best for maintaining the PSP and limiting the scratches that can/will happen?

Thanks in advance!