LAST EDITED ON Nov-05-07 AT 12:52 PM (PST)
 
Posting comments on blogs is a great way to build links.

One way to find blogs to post on is by using Google's blog search engine:
http://blogsearch.google.com/

Just enter some keywords and Google will find relevant blogs that contain the same keywords.

Once you do a search, look for a link that says:
Sorted by relevance Sort by date

Click the "Sort by date" link and that will give you the freshest blog posts. Or, if you're more interested in relevance you can use the "sort by relevance".

Also, I like to click the preferences" link and make sure I have 100 results on each page. This is very helpful...

Some people will only post on blogs that have a certain PageRank or that don't use the nofollow tag.

FREE Firefox plug in that reports the PR as well as highlights any nofollow tags on the page:
http://www.quirk.biz/searchstatus/

Nofollow tags are usually hidden in the html code, but this plugin lets you see them without checking the page's code.

Do note that you have to select this option...Right click on the plugin's logo at the bottom of Firefox and make sure to select "Highlight Nofollow Links". If selected, any links that contain the nofollow tag will be red.

There's some programs that will find blogs automatically for you, searching for blogs that meet a certain PR and/or don't use the nofollow tag:

Comment Hut $97
http://www.commenthut.com/

BlogCommentDemon $47
http://www.submittingmonster.com

I haven't tried either, but I'll probably go with BlogCommentDemon as it appears to have similar features at half the price.

Comment Sniper (free - email registration required)
http://www.commentsniper.com/

You find the best and most powerful blogs for your niche, add them to Comment Sniper, and whenever a new article is posted, it notifies you so you can be the first to post a comment.

Easy Blogger Creator Pro $197
http://www.easybloggercreator.com/

EBC Automatically posts to your own network of Blogger blogs. I'll cover this program more deeply in coming months, as it can be greatly expanded using my webmaster/seo Tuelz.

WP Auto-Installer $197
http://wpautoinstaller.com/
WP Auto-Installer installs and updates multiple WP blogs.

Automatic Blog Comment Poster Software - Post Comments Automatically $150
http://www.post-comments.com/
This is more of a spam/automated version. It may be of interest to some...I don't recommend blindly spamming other sites, but it's good to know what's out there...Not only to protect yourself, but also to be aware of what your competition may be using.

PromoArsenal Suite Blog Posting Software Free one day trial - $60 per month - $297 one time fee
http://promoarsenal.com/
This is a suite of blackhat software that automatically makes blog posts and trackbacks. I haven't used it and don't know much about it, but am posting it here as an option.

Note: Some of these resources were suggested by Top Hat Bob.