GTA's still got it.
Having run out of cities, Liberty City Stories takes place in good old Liberty, obviously. You play as Toni Cipriani, the so-called "wise guy" of the Leone mafia, and he must climb the ranks of the gangs once again. Bet ya saw that coming, did'nt ya?
Then again, were not here for the story; were here for the awesom free-roam gameplay that we've been using to beat up hookers, steal an old ladys car, and evade the cops for years, which translate awesomly to the PSP. Although walking is kinda wonky with the analog nub, everything else is still great.
Even the audio is still kicking. Hearing Lazlow on good ol` Chatterbox is great, and all the sounds you heard back in GTA3 are still there, from the people yaking to blowing up cars. Although you need some good headphones (Maby even those huge speakers you use for watching movies) it still sounds great.
All in all, Grand Theft Auto: Liberty City Stories is probably the best PSP game out there, and if you can convince your mom that you can't get a girlfriend in the game, pick it up as soon as possible.