I was wondering, if there is any way, to check, when Google spidered a site X. (X is not my site), or how often Google is Google spidering this site X?
I have an idea for start...I dont know if it is ok.. but in Google search often appears url: in cache. And you can see, when the cache was created. Well.. if you have to consecutive times from Google cache, it is simple to calculate how often (aproximately) Google is visiting this page?