I was poking through Dragon 311 after someone brought up the Green Whisperer, and the variant clerics in that issue deserve mention as Fun Finds. Of main note are the Evangelist and the Arcane Disciple, at least at first glance. The Evangelist appears to be a superior Favored Soul; it uses sorcerer casting progression off the cleric list, but instead of a random heap of class features, it gets domains, starting with two and gaining another domain every five levels. It adds all the domain spells to its normal spells known and gets the domain powers, which seems a lot more useful than what the FS gets.
The Arcane Disciple gives up turning, domains, heavy armor, and gets a slightly worse HD. In exchange, at every class level he chooses any sorc/wiz or bard spell lower than his highest-level spell slot and adds it to his class spell list. (He also gets the spells from Magic domain, but not the ability.) You'd want to get turning back somehow but it's still potentially pretty rad.