Lots of things...

Tar Ore -> Slime Encrusted Stone
Replace Vanilla Web (now drops more string/occasionally spider eyes)
Replace Vanilla Cactus (can be built up a la scaffolding up to 4 tall.
Can be built up taller in the original fashion. Also, no longer destroys
items on contact)
Added an additional growth stage to flax.
Added Rotten Meat Bush to nether (growable rotten flesh/bones)
Cleaned up code in general a bit
Hopefully fixed mob drops and MFR Grinder? Dunno...