Well, this one’s pretty simple but a lot of people forget to put nofollow on links that are going out.
I don’t mean you should put nofollow on blogroll links but links like feedburner, flickr, and other free services you link to.
Don’t simply copy and paste as you are giving away valuable Pagerank to those free sites.
Well, that’s if you want to keep your PageRank as high as possible. It’s pretty much pointless to put a nofollow on those links anyways.
I know, I know, you want to thank those sites that give you the free service but realize that every link is valuable and if you are serious about gaining traction in the internet world, you should really pay attention here. Besides, those free services probably already got millions of free links from other bloggers who don’t give a shi*. I am just telling you if you do give a shi*. 
Why do people forget about this simple fact?
Well, because most of the time, you end up copying and pasting the code from those free service sites. Now remember they don’t have a ToS that says you need to put a do-follow link in order to use their services. It’s only fair for you as a blogger to protect your Pagerank from going out to links like that. It’s actually very important that you watch out where your outlinks are going to as it will determine the number of search engine traffic you receive over the long term.
Now, don’t tell me you are on the do-follow campaign, that’s just something I won’t get into but it’s only hurting your blog. I think it’s smarter to play the safe side and make sure your do-follow links are only to those sites that you want it to go out and keep everything else, as I said before, a no-follow folks.
I maybe right or wrong but you might as well be safe than sorry.
