Honestly weak; a part of that is, up until recently, GW has been rather protective of listing their product lines online. We've assisted stores in listing their GW items for the POS, but have kept them off the Central Database. With the lifted restrictions however, we're working on that.
As far as RPGs go, we tend to pull in new product from the US distributors ACD and GTS, but the back catalog is poor. I'm always keeping an eye peeled for new resources however and if you know of any relatively complete databases or lists of the material we're happy to reach out and see about incorporating that.