Konami passed along a note saying that Gradius Collection for the PSP has shipped and should start appearing in stores tomorrow.
Gradius Collection packages together 5 classic Gradius shoot 'em ups onto a single PSP disc. The compilation includes Gradius, Gradius II, Gradius Gaiden, Gradius III, and Gradius IV. Extras include new screen ratios, the ability to save mid-game, and a music gallery.
We previewed the game back in December. Check out the link for more info and screens.