The official Google Toolbar runs only on MS Internet Explorer for Windows, making it unavailable to those who use other browsers like Netscape, Mozilla, Opera or even worse, other Oprating Systems. Till now the google toolbar has been the only source for getting the PageRank data. That's history! By now you will have the possibility of making pagerank requests whenever you want and whatever operating system or browser you use. Search Engine Optimizers might even be more interested in getting the underlying checksum formular which is generated by the google toolbar every time a new request to the search-servers is made. Even this information will be available soon.
Due to the explosiveness of making such information public we decided to keep it closed unless you pay a special fee and sign our confidential non disclosure agreement (MS Word Doc, 22K). You will then receive the exact checksum formular plus the commented source code of the algorithm.