I have to say that I don't particularly like the idea of telling users that your post is interesting - this leads to things like chain letters, or "funny" jokes sent around through e-mail: things that I don't care about and would rather not read. I want to be the one to decide if I want to read something, not someone else.

So, a couple suggestions along this line that I do like are to have a rating system, and have notification when x number of users have rated the post, and the post rating is above y. I also like the idea of being able to "watch" a specific user in a forum so that you are notified when they start a new thread (or, possibly, when they post at all - but I think the new thread is the more pertinent option).

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Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com