Lets see, there's school. Socializing there tends to be fun.
Slashdot is good for information, but they all act as if they were all simultaneously endowed with all the knowledge known to man.
Arstechnica is the same as slashdot, except that you can't even get good information there.
NFS4 and CS are great time killers.
Setting up and tweaking my home network and the site it runs is fun, but gets boring after about 45 seconds of switching monitors, mice and keyboards in and out of computers.
And if I get really bored, I still play avalance at
centerfleet.com.