I have a great example to share that shows just how much a good link is worth.
I spend a lot of time working on SEO (Search Engine Optimization), both for myself and for clients/customers. There're a lot of "standard" questions I get asked, but one of the most common is "just how much do links really count?"
A few months ago, I was helping a client with a blog. I totally restructured and redesigned their blog. Their blog had been around a while, but only had 2 posts. I added 2 or 3 more posts before I started the redesign. Originally the blog had been in the root of the site, however, I changed that and ended up with the blog under a "blog" folder and a few "static" pages in the root of the site. I also changed the page naming scheme the blog was using.
The end result was that the search engines had indexed all 5 of the blog pages, but they were now in a different location with different names. If it was critical, I could have created files that matched those old names with a permanent redirect (301) to the new pages, but it wasn't. I knew we'd take a hit for this, but it should not last long.
What's the Value of a Link to SEO (Search Engine Optimization)?
I tracked the page rankings for a few keywords and we took a major hit (shown as drop "A") in the graph. This occurred because I basically scrambled the site around and didn't tell the search engines what I was doing. Notice that only Google seemed to care. And that we were pretty much ranking #1 or #2 on Yahoo and MSN (Bing) for the keyword phrase I was tracking.