Search for electronically filed Form 990s hosted on Amazon S3. Amazon has made this essential resource available, but they have not provided an easy way to search the records. This very simple site lets you search for these records by the organization's name, and provides a link to the S3-hosted XML file.
If you're planning to use these files in your projects, you should get the full listings from Amazon. This site can be helpful if you are only looking for a specific organization's records.