[Satrek2000]

I'd say then you have everyone running arround with swords and no spellcasters - at least to a certain extend. Maybe if you alter the casting system so your spells don't get trashed with a single hit, and magic rings give some speed...

Besides, in the system I mentioned you wouldn't have to level - just use the skill. The higher your level, the better you'll be, and you wouldn't use exp for not using the skill.
Let's say you have 1000 exp. You use the skill every day, so your training modifier will be 2. It's a class skill, you get an addition of 1. In effect, the 1k would count as 3k.
If you don't use the spell and it's in your class, you would get only the clkass bonus, counting it as 1l.
If you don't use it, and it's not in your class, you will drop to a very basic level.

It's just an (unbalanced) draft here to point out what I mean - the numbers would have to be tweaked a bit, to something from 0.5 to 1.5 or so.