One problem that many users face who download a build of Windows 7 from unofficial sources is that they have to verify that the ISO has not been tampered with. In other words: That the hash of the ISO turns out to be exactly the same as that of the version that was distributed by Microsoft directly. Some users who release Windows 7 builds on the Internet post the hash values of these images along with the download to make it convenient for users. Problem that can arise here is that downloaders need to trust the uploader.
The Windows 7 ISO Verifier has been created by Long Zheng and Sven Groot. It basically allows users to verify a Windows 7 ISO image without knowing the hash of it or the has that it is supposed to have. Iso images can simply be dropped onto the exe after download. Another option is to execute the Windows 7 ISO Verifier and pick the exe this way.
The program will then calculate the hash of the local ISO image and compare it with a database of hashes on the Internet that gets constantly updated. The process is fast and tells the user right away if the ISO is verified or not. It can obviously happen that a hash is not listed in the online database either because the release is to new, human error or because it has been tampered with (say another language was added).
Still, Windows 7 ISO Verifier is a nice tool for users who download ISO images of Windows 7.
