For having a considerable jewish population, Providence has suprisingly little in the way of kosher food. There are no supervised kosher extablishments.
EastSide Marketplace and Davis Deli are your best bet for meats, deli, and packaged goods. We used to have a bakery, but no more. There is a kosher certified artisan bakery in Smithfield http://www.comanzo.com/index.html. Only one I know of...
I am not sure what happened to Izzy's in the last year they remade their space into a kosher place along with their catering business out of Warwick. Did they overextend themselves?