Some have held that it was actually a resignation letter: It was found in the office, not on the body. Regardless, you're not seeing the forest for the trees.

The angle of the wound
The gun in his hand
The residue on said hand
The clinical depression
The Medication
The Autopsy
The Investigation by TWO Independent Counsels

Jesus Moxie are you so paranoid that you can't see it? Tell me, which makes more sense: That Vince Foster committed suicide, or that Ken Starr lied and covered up evidence to protect the Clintons?

Come on, man. It speaks for itself.