The benefits of sending trackbacks are that you are engaging in the conversation of whatever topic you are talking about. When you send a trackback and quote a popular blog, that blog's readers become aware of your blog when they read the comments.
Since you are quoting or expanding on whatever the original poster is saying, you are not cluttering up their blog by posting your thoughts on your blog.
Finally, the blog you send a trackback to, becomes aware of your blog and who knows, potentially they could quote one of your blog posts in the future.
Mark
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