If you are defining racism to mean that one race is superior to another, I see a lot of it here. For instance, there are many threads about "illegal aliens" committing horrors that turn out to be untrue...and the reason given is usually tied to the person's ethnic group. And most of these threads are about Mexicans. Just yesterday froggy posted a thread about a girl with a Spanish last name and called her a Mex without even knowing what her heritage was...

And mal goes out of his way to post things that show blacks in a bad light...makes one wonder.

Then there are quite a few that believe, or say they believe, that black people are genetically less intelligent than white people. We also have a couple of black men that are quite racist against white people.
I don't think it's part of a trend but it does seem that people are more vocal about it because politicians and certain members of the media (for example Lou Dobbs) like to use issues of race to get people angry.
As to why people seem more racist online...it's easier to say what you want without being shunned by your friends and coworkers when you are anonymous.
A lot of this is politically motivated...politicians get votes if they appeal to these kinds of dark thoughts.