I bought my PSP, maybe two weeks ago. It's a Black Slim. I haven't noticed any scratches whatsoever on the surface, but there are some small, unnoticable scratches on my screen. But they won't show up when you play, only when you really look at them with a correct lighting set-up.

And yeah, I really suggest getting a screen protector.

Well. I got my psp couple of weeks ago and overcharged it just to make sure.

And ever since, it has run approx 6 hours on backlight always on high and headphones almost on full volume.

Maybe your battery didn't charge completely on your first charge?

I own only two games currently:

Gripshift
Loco Roco

Gripshift is probarly my favourite, but I also like Loco Roco. Haven't really played them much yet.

And two games are appearing in my mailbox any second now:

God of War: Chains of Olympus
Patapon

And from those I think I will like Patapon more! :D

I have a Sony 8GB memory stick card. It cost around 89 € which is quite expensive when considering it. But it's really fast and has been working really well.

But for you, I would probarly recommend a 2GB or 4GB memory stick. They are quite cheap and efficient.