This has been a SEO strategy for a long time, as we were told that this was something that Google used.
How well it actually works in real life, however, is something I've been suspicious of, as I felt that it relied on a level of sophistication from linking sites that was generally not present.
We're all hoping they do something like this ...
All of us here at MegaCoolBlog like to
<a href="mycoolspeakersite/apple">buy apple speakers</a>
with our extra money.
However, they invariably, instead will write something like this, which is just as helpful to their readers, but probably not to a search engine.
All of us here at MegaCoolBlog like to buy
apple speakers at <a href="mycoolspeakersite/apple">this site</a>
with our extra money.
This really defeats the whole "anchor text" approach to web crawling, since most of the anchor text will say "this site", "click here", etc.
In fact, anybody that actually uses the anchor text in a manner that is actually useful to search engines is probably doing so on purpose, which may make good anchor text almost a vote against a site, rather than a vote for it, since their attention to this detail that helps search engines but not really actual readers, is suspect.