what is the best way for figuring out 1.the request per second that a MOSS 2007 server farm receives and then, 2.the request per second that it can response?

Hi, Thanks to share your post. For the issue, please see the requests per second required for SharePoint: http://blogs.technet.com/b/wbaer/archive/2007/07/06/requests-per-second-required-for-sharepoint-products-and-technologies.aspx. And the capacity planning for windows SharePoint service: http://www.microsoft.com/resources/documentation/wss/2/all/adminguide/en-us/stsb07.mspx?mfr=true. And the detailed processes should be calculated in the followed article: http://technet.microsoft.com/en-us/library/cc262574(office.12).aspx. Hope this could help you! Leo