Yes - In your User CP - find the section that describes "Subscriptions" If you check "subscribe, but do not notify" you'll see a little envelope on the right hand margin of the thread title on threads where you've participated. (On the old board, it was a black dot on the envelope on the left.)
If you check off "notify" you'll get emails every time someone replies to that thread - most people don't like to be bombarded like that. :)