indyank - 5:48 pm on May 20, 2011 (gmt 0)

Google returns cache for some /robots.txt but not as a general rule.

you are right but it is strange that they don't do it for all sites.Not sure what influences it to show cache or not.

Interestingly many sites have title for robots.txt as "robots.txt - sitename".

In a few cases, the title is some text from the robots.txt file and for one of my sites it is - "View the robots.txt file to see if - sitename"

Google does change titles in SERPS and this has been happening for some time now.There are many factors which influence the change in page titles.In my above example, I am not sure what made google assign the text "View the robots.txt file to see if" to the title.

It is not just anchor text but a few other things influence the titles created by google. Though many have reported title changes in google, we are not sure what all influence it other than anchor text.