I am working on a campaign idea in where I remove the Arcane/Divine magic barrier...and a lot of Cleric spells are going to end up avaible to wizards and sorcerers but at different levels. I will post it once I get it figured out
There is some discussion of this in my alt.sorcerer thread. The sorcerer there can pick spells from any list, but has some restrictions that balance it reasonably well.