Is sending a second LOCI, if you've heard nothing since your 1st, a bad or good idea?
On the plus side: you are showing continued interest and hopefully giving them some useful info. about yourself.
On the negative: you are bothering them...?
I'm also undecided as to what info. is important. I never mentioned my desire to attend school in a certain city, I also never mentioned some activities I've begun doing... I would try to just send a "brief check up" type LOCI.