The FS4SP Query Logger will make it easier for developers and IT pro's to debug user queries.
This tool will monitor the internal query logs in FAST for SharePoint and re-execute the query and capture the result XML directly from the QR server. The xml will show what has been done to the query internally in FAST and is useful for debugging purposes.
If you have more than two queries a second it might not log all of them in the current implementation.
As it uses the internal QR server in FAST it has to be run on a FAST query server.
Using this tool in production might impose a security risk, as you will be able to execute and view results which you as a user/administrator might not have the rights to view.
If you are interested in FAST for SharePoint stuff, check out my blog -
Tech and Me