I just came across this in an email. Someone inquired about having their pages re-directed. Their rankings dropped and they wanted an idea of what went wrong.

They basically changed all their urls from abc123 to abc-123. Honestly, folks come on! Where did you read that? Matt’s blog? Did you really think that is going to [...]

I have been getting a lot of evaluation requests for SEO. What I have been noticing is that a lot of sites have very poor designing. Even if we did optimize the site and traffic came in for targeted phrases, conversion would be low.
The way a site looks and functions is very important. I have [...]

Here is a list of things I see many new web site owners forget to check or do not know to check before launching a site.
Common mistakes:

Using the same title / description tags throughout the site. Doing this will
cause you to fall into Google’s Supplemental index.
Adding all the keywords for the site on one page [...]

Yahoo Answers has a major flaw. The idea behind answers is so that people can ask questions and get answers from other users. However, some of these answers are not correct. Some are guesses at best. It is like the blind leading the blind. Some of these questions could be answered by typing the phrase [...]