moses?

quick post...
I'm finally into Joshua! (they rest of you must be so far ahead of me now... I can barely see you up there on that dusty road we are all traveling on).
Can someone remind me what moses did to not garner God's blessings on letting him into the new land? He had to stay behind on the mountain when he died, and I forgot what he did that was so bad.
(I remember Aaron was sort of punished in the same way for helping to make the golden idol)
Wow... How could Aaron have decided to help make the golden Idol!? It's not like God wasn't clear on this one :)
I also found the section on the blessings and curses for following the "law"... The blessings were about 2 paragraphs, and the curses just went on and on, and were some of the worst things I've ever heard of doing to another human. I almost found it comical, in how each "curse" tried to out-do the previous curse.