We went to a teamroom and I just said: "May 6th is my last day."
And he took it very well actually, he did say he had talked to another manager about moving me to a different team that was .NET, but he seems pretty cool.
The only thing was he asked if I was working for HP. Apparently if it was a competitor, he would've walked me out the moment I gave notice. WHAT? I told him I was going to be a wedding photographer. No competition to Dell there.