Robert_Charlton - 8:48 am on Jul 31, 2013 (gmt 0)
The Google linking guidelines are here, and I suggest a careful reading....
As Barry points out, a big change/clarification is "optimized anchor text in press releases"....
from Google Link Schemes - Webmaster Tools Help...
Here are a few common examples of unnatural links that violate our guidelines:
...Links with optimized anchor text in articles or press releases distributed on other sites. For example:
There are many wedding rings on the market. If you want to have a wedding, you will have to pick the best ring. You will also need to buy flowers and a wedding dress.
I'd cited some of the guidelines less than a week ago in this discussion [webmasterworld.com...] ...so I've read the document that recently. The above example was so spammy, though, that I've got to confess that it didn't appear to be a change in policy. If read strictly, though, the guideline does appear to be a change that's going to affect many press release services.