Trackbacks are a great way to allow comments on your blog. Since interlinking is at the heart of blogging, what has created the blogosphere, I think it is great the some bloggers have chosen to allow tracbacks, even if they don't support comments.
I ran into an example of this at jra's thoughts.
Unfortunately, not all wiki(blogware) supports wiki(trackback), or the "same thing only different" wiki(pingback) protocol. That's a shame. Keeping your opinions on your own blog, while automagically interlinking to the source that triggered those thoughts is the perfect example of why blogs are important to everything from collaboration to "keeping in touch".
There are many tools on the web and for our desktops to help us find and read blogs. Some of these tools are based on the RSSv1, RSSv2 or Atom syndication protocols, some are blog search engines and some are listing services. I won't try to evaluate any of the tools out there, but I'm posting this as a convenient list of links to reviews and sources available on the web.
I use the following in various situations.
Many aggregators allow you to export your list of feeds and links in a variety of ways. So, you can easily add a list of RSS or Atom powered links, headlines or a blogroll to a web site or blog. All-in-all, these tools are a great addition to the collaboration kit of anyone living the TeleInterActive Lifestlye.