It is a skilled program for checking very large lists of URLs for Google PageRank. You can simple check more than 10,000 URLs without getting blocked.
1 Bulk PageRank Checker allows you to use an option which limits the number of sites that the program can check over a minute or an hour. This is a good way to make sure that you wont get blocked by Google when checking for example a large list of 10,000 URLs from one IP. Just enable the setting under options and click on start, its that easy.
If you want to maintain a high speed and quality with the possibility to use multiple IPs (less likely to get blocked), then you can setup Personal Web Proxys on one or several of your websites. Its very simple, all you do is put our small PHP script on your website (included with the software) and let it query that script. It will then use the websites IP and not your own. This produces high quality results and lets you check many sites at a high speed.
If you only want to check for example .com and .biz domains then this application can take care of that for you. You may in fact turn it around, so it checks all sites except for .com and .biz domains. The program allows you to include or exclude any URL that does or doesnt contain the string(s) of your choice.