Chacal
First Post
The cool thing with the Mystic theurge is that you can come with lots of new broken/munchkin feats about multiclassing spelcasting classes without having everyone scream at it 
Here is my "broken feat of the week" :
<insert cool name here>
Prereq : Knowledge(religion), knowledge(arcana), spellcraft , =7
Domain (magic)
Benefits :
Choose an arcane progression table. You gain 1 slot for each level you can cast, in which you can prepare spells from your clerical and domains lists.
Alternate (weaker) benefit :
You can prepare spells from your clerical and domain spell lists in your arcane slots. You can use at most 1 slot / slot level in this way.
Alt.Alt.restrictive benefit: You must use one of your arcane slot from each slot level to prepare a spell from your clerical or domains lists.
so a Wiz 17 clr 1 can cast miracle ! woohoo !
Is it that bad ?
Chacal

Here is my "broken feat of the week" :
<insert cool name here>
Prereq : Knowledge(religion), knowledge(arcana), spellcraft , =7
Domain (magic)
Benefits :
Choose an arcane progression table. You gain 1 slot for each level you can cast, in which you can prepare spells from your clerical and domains lists.
Alternate (weaker) benefit :
You can prepare spells from your clerical and domain spell lists in your arcane slots. You can use at most 1 slot / slot level in this way.
Alt.Alt.restrictive benefit: You must use one of your arcane slot from each slot level to prepare a spell from your clerical or domains lists.
so a Wiz 17 clr 1 can cast miracle ! woohoo !
Is it that bad ?
Chacal