A YouTube user found a way to transfer more PlayStation 1 games to the PlayStation Vita using yesterday's firmware update, as opposed to the nine listed on the PlayStation blog. YouTube user FistFullofPotions discovered that downloading PSOne games to the PS3, leaving them uninstalled, then transferring them from the PS3 to the Vita seems to work across the board. As he notes in the video above, this is done at your own risk as these games haven't gone through Sony's quality control. We've confirmed the method with a couple of games, while NeoGAF and Twitter users also had success with it.
The workaround does more than enable more PSOne games on the Vita – it serves to highlight the strangely low number of PSOne games available on Vita in the US, especially when compared to the 129 listed in Europe and the 200+ in Japan. We also discovered at least a couple of unlisted games, Cho Aniki and Money Idol Exchanger, can be downloaded to Vita the usual way and apparently run OK. These games can be downloaded from the Vita PS Store. As long as there is a download button next to a PSOne game on your download list, it can be downloaded straight to Vita, no PS3 required. This is the same 'side-loading' method used to get PSP games that aren't available on the Vita store onto Vitas
Update: NeoGAF has a users-confirmed list of PSOne games that can be transferred using the PS3, and those that can be downloaded from the Vita store as well (in bold). The full list is after the break.