@lostmatt,
good idea! We have covered the usage of 不 in different lessons and levels, but still not in a segment.
We all think it's a good idea. And in future we will definitely have one.
And if you have any questions about the word usage, you can comment on the site or send me an email at gail@popupchinese.com.
Gail
from Popupchinese.com