I have always wondered whether I should post my comment on the original blog's comment area, or put up as a post in my own blog.
Here are some suggestions:
Commenting vs blogging: opposition more than composition
Waiting for the right solution, I usually write my comments like standard posts in my blog, then I put short messages in the target blogs like simple comments, giving a flavour about my opinion, and inviting to read the full post on my blog. It's simple and it works.
The Tragedy of the Comments
If instead of commenting, you write a response on your blog, you are standing behind your words, and associating them with the rest of your writing. The social dynamics are very different; you think more before responding instead of posting a quick flame. You can't really spam, as you are only soiling your own garden.
Do it in your own backyard
Imagine that you really don't like me. One evening you get mad at me and drive over to my house where you daub the message "Matt Mower is a total asshole" in bright yellow paint on my walls for everyone to see.
Note that you haven't daubed your own walls with your message of hate. I think it would be very different if that was what you had to do. I think the inevitable consequence of that would be that you would have to learn to be more moderate or people would stop coming by.
-- via Paolo's weblog
I like Alan's cogdogblog warning:
Note: Blog-spamming roaches beware- we will immediately remove, trace, and trackdown all unsolicited comments containing objectionable URLs. You will not win any Google points here. Any thing not-related to content on this entry will be sprayed and killed on contact. Comments will be open only for 30 days.
Humans with something meaningful and relevant to say to us are welcome to write their comments via the button below. Bots, porn peddlers, spam roaches are instead invited to sample some doom.
I am not a spammer but have something to say
Alan, is your warning effective? (and I like the graphic too!)