The Chicago Tribune hasn't "released" the name of the NIU shooter, but if you follow the leads in THIS article, THIS has to be the guy.
HERE'S something else I dug up.
I think I may have found the guy's Live Journal page. By searching his UIUC alias (sans "2"), I found this (skazmie.livejournal.com/).
I really wouldn't paste that link if I were you - The page seemes really wiggy, my SpyBot and StopScript programs started going nuts when I checked it out, which led to the Blue Screen of Death. It might just be Vista being Vista, but I don't trust it.
All you need to know is that the user name is "steve... kaz. ..." & it's titled "Emo-Sexual Blog".
Update: It looks like this one was a false-positive. Sorry, Emo-Sexual Blog - Keep on keeping on.
I went to school in DeKalb and still have a bunch of friends back there (some who work for the university), but I never knew the shooter (nor would I want to).
I just put together some clues that were being floated by various media sources early this morning. I cannot vouch for the validity of any of the aforementioned sites or any sites mentioned in the comment field.
I just happened to be awake at 3AM, did a few simple web searches, and posted what I found - That's it.