According to the ESRB, several more PSone titles are coming to the PlayStation Network in North America (and likely Europe), including multiple games from both the Spyro and Street Fight Alpha series.
Here are five more confirmed PSone classics:
Spyro: Year of the Dragon
Spyro 2: Ripto's Rage!
Street Fighter Alpha 2
Street Fighter Alpha 3
Thus far, Sony has provided a decent archive of PSone classics on the PSN... in Japan. In North America and Europe, the PSone offerings are fairly sparse. We'd love to see titles like Metal Gear Solid and Final Fantasy VII make their way to English-speaking regions.