To expand a little bit:
N64 Emulation: I've been testing the entire N64 library (I'm up to M) And I'd say emulation is at about 54%. By that, I mean, 54% of games will get into gameplay. There's still speed, and the possibility that it could crash later in the game, but 54% is pretty decent if you ask me. As for games you actually care about... Well, you'll have to fill us in so we can let you know their status.
(or, you could also check out the
compatibility list, but it's not exactly up-to-date.)
PS1 Emulation: The masterful Notaz has been working on PSXreARMed for some time now, and it's an amazing piece of software. There are a few games that don't work in it, but a vast majority do, and I'd say it's safe to assume that the games you want to run will work.
DC Emulation: I posted about this in a thread a few months back, but essentially, someone did a quick compile of a DC emu on the Pandora and showed off Shenmue on it. Since than, not much has been said or shown of it. EvilDragon has admitted that a PND still exists, but we'll have to wait for the developer to come out and talk about it. That, or someone else takes up the project. There's a lot of interest in DC emulation, so I'm sure that
something will come about eventually.