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1. Let's say this site is on-topic and high quality. If PR did not exist, would you exchange links with this site?
2. Regardless of PR, would you receive highly targetted visitors from this site?
If you can answer yes to the above two questions then I'd let PR pass and go for the good, on-target traffic from a high quality site ;)
I would suggest that you stay away from link partners who employ questionable tactics, not by inches but by several miles.
The first simple question that you should ask yourself is why they have to use such as the weird character like @ in their file name...Perhaps their intention is to prohibit spider to crawl link pages.
To answer your specific question by yourself, you may want to look at Google cache to determine whether the page is crawable. If there is no cache, you better say "NO" also.
Another important point is that:- Don't be deceived that the site is of good quality because the main page has PR5. The danger zone here is that if the webmasters intentionally hoard PR by prohibiting spider to crawl other links, they also have a bad habit of linking out solely of their own sites. As a result, link out is in a closed loop within its own network and it can be a perfect condition for G to detect that.
So here is the TIP. Whenever I encounter this instance of link page PR0 and homepage PR4+, I will also look at the cache of the homepage. If no cache for homepage (although PR is shown), you can assume the site suffers penalty. If that is the case, would you still be interested to exchange link?
thank you for this useful info.
I have checked Google cache with a few link pages, and the experience is really interesting in some cases.
For example one of these pages IS indexed by G, however everything can be seen on the cached page BUT the links! That area is totally empty. I looked at the source code which seems to be correct...it must be some Java script trick..
So one has to be careful...I will