Google keeps visiting blogs and websites spread over internet to check out for updates. The frequency of visit on a particular blog depend upon the quality of Blog or website.
For example Google may be visiting your newly created blog once in a month, and at the same time he may be poking his nose in TechCrunch every hour.
Updated blogs with high Page Rank are visited daily.
Colder blogs with low Page rank are touched once in a month.
So, its quite clear that you can know how much Google loves you by the frequency of his visit. Do the hell with visitors, everyone want Google uncle as a chief guest on their blog daily. Because if Google comes on your blog, the visitors will come anyway.
The question is how to find when Google crawled you recently?
To check out just search your website name in Google search and click on cached link there …
Click on Cached link and you will be taken to a page where on the top portion some information will be displayed.
The date displayed is the last time Google touched you after your update.
Thus you can easily tell that on 18 Oct (in case above) , Google uncle came.