Black Lotus Project
If you have not checked out the BLP website already, it is definitely worth a look.
It provides various statistics and graphs for MTG card prices and also, in the blog section, lists a number of embeddable codes that can be used to place tickers on sites.
Check out the site here – http://blacklotusproject.com
The card charts are here – http://blacklotusproject.com/charts/
Their Internationalized price ticker is here – http://blacklotusproject.com/blog/2010/2/11/internationalizing-price-ticker/