Theymos has installed a much-wanted "Watchlist" feature. Click the "watch" link on the top of a topic page to add it to your watchlist. Click "Watchlist" at the top of the page (if you are using forum's default theme, the SMF default theme, or the BlackBox theme) to see unread replies to posts that you are watching.
Please do not make "Sub" posts anymore. If you see someone make a "Sub" post please redirect them here.
From the OP:
I have added the much-requested "watchlist" feature. It's like "show new replies to your posts", but it only shows topics that you've chosen to watch, and you needn't have posted in the topic. I only added it to this forum's default theme, the SMF default theme, and BlackBox.
There is no listing of watched topics, and the only way to remove a watched topic from your list is to click "watch" again. Maybe I'll improve this later.
Sometime in the future I'll automatically remove all "sub" posts and convert them to watchlist entries. "Sub" posts are not allowed anymore. If you have any non-traditional "sub" posts, please delete them manually.