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I hope they don't come to PSP or, if they do, they're kept separate. The whole PSP system is too compromised for a trophy system to work properly.
I'd rather they focus on games.
save it for the 2
If they were on the PSP then people could use CFW to get them easily & quickly. If that happened then trophies would be pointless (kind of like achievements now that so many people have hacked them and it's easy to just hack in a few at a time to avoid being caught).
Sony already stated that because it's easy to hack the PSP they are not doing it. Until they make it virtually untouchable, I can't see trophies coming to the PSP, as much as I would like them to.