None of my ZC feeds are updating.

Here are what the three that I am monitoring look like


http://taogem.com/taogemst_myzencart...d=best_sellers


http://taogem.com/taogemst_myzencart...&feed=featured


http://taogem.com/taogemst_myzencart...d=new_products

Any ideas where I would start looking to figure it out.

Neither my Google Reader is updating new products, nor is the feed widget within my WordPress blog.

They had been working just fine ever since I started monitoring them.