In early 2002 Benzino was coming out with an album, and he needed buzz. So he went after the top rapper at the time, which was of course Eminem.
He did it for no reason. Claimed that he gave birth to Eminem's career, and that without Zino's help he would have been a nobody (Eminem was featured in the unsigned hype part of the Source couple years back). Eminem finished him off with "Nail in the Coffin" and "The Sauce".
But Benzino is like a bad rash that won't go away. At that point mainstream America still didn't know who Benzino was, aside from the people who were hardcore Source fans, as well as internet hip hop heads. The beef became old news that no one cared about anymore.
But in the late 2004, at the time Encore was ready to be released, Benzino went on a couple radio shows, including the Wendy Williams experience, and very hypocritically talked about the beef. He stated that Eminem was the one who started it, and now that it was "blown out of proportion" (again, the only people who knew of the Benzino/Eminem beef were internet hip-hop fans, and die hard source readers) he wanted to end it.
Then Eminem released "Encore" and did an interview with Sway, and they talked about the Benzino beef, as well as the song "Toy Soldiers". Benzino saw his face on MTV for the first time, and decided that it's time to re-spark the beef. Ironically, he again has an album coming out.
So almost 3 years later, this non-sense beef is still going on. Benzino is like a psychotic ex-girlfriend that just won't quit. So after his new album dubbed "The Arch Nemesis" flops again, we can expect the beef to die down.
PS: Remember, the infamous Eminem's freestyle tapes had nothing to do with this beef being sparked. That came later on. And now that Benzino has crossed the line, and as a grown man, used the word "cracker" to refer to a white man, his argument about Eminem being racist is no longer valid and relevant in this issue.