I have created a bulk yahoo backlink checker that will do ~100,000 records/hour. It is still in beta while I develop the UI, but if anyone would like to try it out, let me know. I will only accept a few of the larger datasets for the beta (especially people who will have an on going need (ie 75,000+ per week)). The cost, while we are in beta, is $1 per 1000 domain names. Alexa and DMOZ can also be checked at an additional cost of $0.50 per 1000. Google PR will be added in the future, but it's significantly slower, and will cost an additional $1 per 1000 domains. -Jason
Once we are out of beta, you will be able to request a demo of a small set of domains ~10-50 so you can to check your file format, our output format, and the accuracy of your results. This will be a one time check, unless there is a problem and you need to recheck the same list. -Jason