I find this rather annoying...
When I find my profile theres an option to see unanswered threads, answered threads, unread, and My Threads...
When you click My Threads, it any and all threads you have ever either
1) Commented on
2) Up voted a comment, or marked a comment as an answer
3) Viewed (OK I'm going a bit overboard on this one, but you get the point of what I'm getting at)
There should be a separation of threads from threads you are involved with (Commented on or Up Voted or marked a proposed answer to someone elses post) vs posts that you actually created.
It be nice if My Threads listed only the threads that I actually created.
While threads involved with would be under it's own filter, "Contributed" would be a good class.