For a few weeks now, Mack Collier, author of one of my favorite marketing blogs, The Viral Garden, has been hosting a “chat” on Twitter using the hashtag #blogchat.

My favorite way to follow the conversation is to use TweetChat, a tool developed by Brooks Bennett. TweetChat turns a hashtag into a chat room, separating out and displaying all the tweets with the hashtag for a particular “room.” TweetChat auto-refreshes, and you can also post directly from TweetChat; the app will automatically append the hashtag for you.

In addition, Brooks has enabled a print format so you can save a transcript of the chat session. It’s a fast-moving conversation, so the transcripts are lengthy (71 pages for a 2-hour period tonight). But there is a wealth of information if you care to dig it out.

Mack kicked off the session with a question about how to measure the effectiveness of your blog.

Blogchat: Sunday nights from 9:00 to 11:00 p.m. EDT

Download this week’s transcript: Blogchat 04-26-09.pdf

Note: remember that, like Twitter, the transcript prints in reverse chronological order. Scroll to the end to find the beginning of the chat.