Well, there is now... sort of.
I just put together this very nasty, barely tested bit of PHP to scrape the blockexplorer site for a given address's total received amount.
$ch = curl_init('http://blockexplorer.com/address/'.$donation_address);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1) ;
$html = curl_exec($ch);
If you save that on your site as totalbtc.php and give it an address like this:
Then it will output the total received of that address.
As I said though, the above is downright crap code, just put together in the last few minutes... version 0.0.00.1a
Thought it might help get the ball rolling for other people's ideas anyway.