You can confer some of your site's reputation to another site when your site links to it. Sometimes users can take advantage of this by adding links to their own site in your comment sections or message boards. Or sometimes you might mention a site in a negative way and don't want to confer any of your reputation upon it. For example, imagine that you're writing a blog post on the topic of comment spamming and you want to call out a site that recently comment spammed your blog. You want to warn others of the site, so you include the link to it in your content; however, you certainly don't want to give the site some of your reputation from your link. This would be a good time to use nofollow.
Hi Brian, great list. I noticed you mentioned using Kraken to optimize your images. A couple other tools I’ve found to work really well are ImageOptim (an app that you can download for your computer) and Optimus (a WordPress plugin that will optimize them when uploaded to your site). I’m not sure what your policy is on including links in comments so I won’t link to them here (even though I have no affiliate with either one.) Hope those resources can help someone!
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