Pages with no cache question

I just checked some of my linkpartners to see who is linking back to me before the dance...
My question: assuming the pages were my link is posted are old enoghf to be indexed they show a great PR but have no cache at google.

Can I asume that those site planted a robot.txt file that tell google not to index those pages ? and that the pr is only estimated?

This trick is old but I just want to make sure there is no other option....

Asher,

I have a site where my index page had been cached and has a PR4, down from a PR5 2 updates ago. After the last update, the site is #3, #1 and #14 for 3 competitive terms, but Google shows no cache. I know I didn't plant a robot.txt file, so there must be another reason.

well dear SEO any other comments?
before I start deleting those links

why not see if there is a robots.txt in the head before you go jumping to that conclusion, their server might have gone down, like that's never happened before

Sub in the domain name and take a look like this:

http://www.seochat.com/robots.txt

ok I checked , some of the site do use a robot.txt file keeping out google spider from indexing the page . those link are gone .....

what about sub domain can anybody clear it for me.
will I benefit the PR?