Made another Google gadget the other day, this time doing a search in Pricerunner, to compare prices and products. I believe Pricerunner is a very good service, and widely used in Sweden.
The gadget looks like this:
Today it supports Pricerunner in the UK, Germany, Sweden and Denmark. Hopefully I will be able to add US and France soon.
You could also try it here.
Add Pricerunner to your Google homepage.