is there a way to get rid of a spell once you buy it? i have allot of usless spells that i will never use. Anyway to delete them? i even messed up on some spells trying to make them Like try to make a spell that locks something and trap it at the same time :| .. resulted in failure so i have like 4 spells pretty much named the same like that.

Can't remember well....point at the spell name and press SHIFT + right mouse button. Click yes when the box ask you.

not for xbox, i dont' think

Yes, shift-click on the spell in the spellbook menu. Don't fear that you are losing the spell forever. Once you remove it from the spellbook, the spell sellers start selling the spell again, so that you can buy it again if you need it. Naturally, you will pay for the spell again as well.
This works in plain Morrowind. I have no experience with Tribunal, Xbox, and so on.