block.tpl.php assigns same ID repeatedly

To clarify, the initialization of the accordion javascript assumes only one block. The AccordionList function itself works just fine with as many accordions as you like. So it's just a matter of assigning unique ids to the blocks, and fixing the init code in template.php to loop through all of the blocks and build a complete list of IDs to pass as an array.

This works. In my own solution, I did something similar, but I used the array syntax for AccordianList. So:

		$accordians = '';
		foreach($block_list as $block) {
		 $accordians .= "'accordion-{$block->module}-{$block->delta}', "; 
		}
		$inline_script = $vars['inline_scripts'] = '
		function init() {
		    var myAccordionList = new AccordionList(['. $accordians .']);
                    //etc...'

Not sure if that's a meaningful optimization, and it sure makes for ugly quoting, though nicer JS in the end, IMO. Anyway your solution is certainly good enough, so it gets my RTBC.