What is a good tool to use now that overture is dead?

You're right. Overture is so slow it can be pronounced dead and there are rumors that Yahoo will be pulling the overture tool. What I suggest is that you use the following tools:

Google trends: Most good keywords will have a steady graph, you can also use this tool to compare up to 5 terms.

Google returns: Usually good terms will have at least 100,000 google returns. Remember to use quotes ("keywords here") around the terms, if you dont, this will search any page with the two keywords in it, if you do, this searches only pages with the exact phrase in it.

Google images: This works great when searching IDNs. If you want to verify an IDN translations simply plug it into the Google images box and images relating to the term should come up. If they don't, I would research the term a bit more.