Hot off the their Anime Expo panel Crunchroll announced that an app for PS Vita will be coming in the near future. More news about it will be coming soon.
Crunchyroll provides anime and drama streaming with tons of titles to choose from straight from Japan. It is unclear if this app's usage will be included with a paid membership like with the PS3 version.
The Crunchyroll app PS3 is available in the US only and this might be the case for the Vita version as well.