http://www.guitartricks.com/2000/host.php?input=66
A search here turns up 116 threads relating to "modes"; wading through them all may be tedious but you just may find something that helps.
Edit: Here's another site that covers modes ( and many other guitar topics )
http://www.zentao.com/guitar/modes/
[Edited by John O'Carroll on 05-01-2003 at 01:43 PM]