Not really because I don't have a PSP, but I wish they would port Sid Meier's Pirates to PS3. That game is available for PSP, so you might want to check it out (though is a different game from Civilization).
I'm not sure why they didn't make one. There are limitations on input, but it should be doable. It could just be that they didn't have the budget to do versions for all platforms. Maybe they figured if they were going to make one portable version, it should be for the DS because of the touchscreen and the lack of a Wii version for Nintendo fans. However, they may still do a Wii version, so if the game is successful enough it may eventually come to the PSP.
Every version of Civ Rev uses the same gameplay logic, so for each platform they have to do seperate art assets. The main versions were 360/PS3 and the DS art is simple. They didn't have the staff to do Wii art, or PSP art. If they do a Wii version, though, they probably will use that art or a variant of it for the PSP.
And honestly, there are no games like this for the PSP. Pirates is an awesome game but totally different. Meanwhile the DS has several (anno 1701, Age of Empires, Civ obviously). Do what I did, bite the bullet and get a DS.
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