There are complaints in the Google Web Search Help forums that Google removed the similar link found near the cache link in the search results.
I personally do not see them anymore either - although I am not sure if it was removed during or before the new design launched a couple weeks ago. We do know that Google dropped realtime, wonderwheel and image sizes after the new design, although some were not removed because of the new design.
Here is a picture of the similar link as it was during the old design.

Now, to access them, you need to use the instant previews feature and at the bottom of the preview, you will see a link to "similar."

Google still has the pages similar to feature on select queries but not the similar link on each result.
If you really miss it, you can search for similar pages on Google as related:www.seroundtable.com - the thing is, the query doesn't work as well as it once did.
Forum discussion at Google Web Search Help.

Comments:
Peter Brown
07/11/2011 12:47 pm
Are you sure it has been removed? I've been seeing similar pages moved to be beneath the Google preview
Barry Schwartz
07/11/2011 12:52 pm
You are right, updating story, thanks!
Alex Juel
07/11/2011 01:13 pm
I use related: all the time and I haven't noticed a drop in quality.
Search Ramble
07/11/2011 02:35 pm
something interesting but of almost no use :)
Mr Marketology
07/11/2011 02:40 pm
Thanks for providing a view to where the similar link resides. Do you think they did away with realtime because of Google +
brandonswenson
07/11/2011 09:58 pm
More changes and More Changes. This is why we SEO's are good at what we do, we stay on top of this stuff! lol Brandon http://www.jailresource.com