Agreed with the above on Castlevania SoTN. In fact that's one of the things that got me so giddy, playing a PS1 port of one of my favorite games on a handheld, being on the road or whatever and pulling that game out. Now if they'll just put Xenogears on the PS Store
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My main gripe tho is how some of the games from the PSN that should be able to stream or be dl'd onto the PSP can't. Like Mortal Kombat II, because of it's internet play you can't put it on or stream it to the PSP despite it being pretty low on graphics. However Castlevania SoTN, and Twisted Metal II both have places on my PSP memory stick atm. Heck, even Pixel Junk monsters can be streamed. It's not a major gripe, but I did buy MK II with putting it on my PSP in mind, so was a little dissapointed when I couldn't even stream it heh.