Three out of the four games were not released outside Japan; the only one that was seen in the west was Um Jammer Lammy -- a rhythm game spin-off of PaRappa the Rapper. The Ide Yosuke game is yet another Mahjong game, while Wai Wai Bowling is, um, bowling. Lastly, Baroque Syndrome is a prequel to the PS1 RPG Baroque (which is also available on the PSN, at the same time ported to the PS2).
While there's really only one or two titles that are worth getting on that list, it still is quite annoying that the Japanese PS1 game library is way better than ours. When will our library start flooding with more and more PS1 games?