There are some things that tick me off, I'll list them here so you can check them out yourself
1: Why are these not with the same height, three of these posts are consistent but the second post has put them all in disarray.
2: People are lazy. That's a fact. The problem?
they won't usually delve deep into the text. one category per line can highlight these sub-categories better.
as for adding fancy pictures and such for each of them then that's way better.
the human mind can be really fickle sometimes you put a pic that best describes the word then they won't bother about anything else.
3: over usage of this ad banner
you have a sticky sidebar that states all these points in it. so it's better to not use this one at all.
There are some other things that may need a little bit of fine-tuning as I'm somewhat sleep-depraved I don't have the right state of mind to check them out. I'll probably come back tomorrow to check them out.
as for other things, it's packed quite nicely. kudos for work well done