I spawned near a huge section of taint, and I'm fairly sure it's spreading. My panicking in the Minecraft chat room turned up the suggestion of turning off the spreading in the config file, so I dug out Thaumcraft.cfg, and found this:
# The chance per block update (1 in n) of the Taint biome spreading.
# Setting it to 0 prevents the spread of Taint biomes.
So...it seems like it's not spreading? Now, either I'm going crazy or there's something else causing it to spread. Could Tainticles and the like (tainted spiders, creepers, etc) cause it to be spreading?
In what ways can the taint spread?