abraham lincoln assassination conspiracy

a student in my class think that the abraham linclon assassination was a conspriacy. is their any info on the web about this i searched and failed. please enlighten me.
if there was a conspiracy that make it one more similarity between him and J.F.K
plz post your thouights

//ed spelling in title//

[edit on 23-5-2005 by DontTreadOnMe]

Here's a current topic on the Lincoln assassination:
www.abovetopsecret.com...