Not much of a list yet, but here goes:

Wood fiber plant; Plant wood fiber in the ground to grow more!
Savilior plant; Craft yourself some Savilior seeds, plant them, and have a great food source!
Limarion plant; Good for getting glowstone, but you may not want to eat the fruit!
Instis plant; The fruit can heal ~5 hearts over 5 seconds!

All of these seeds can be planted on wood (logs), as well as farmland.

Use the curse link :P