It would be nice to be able to mark a thread that you are currently reading as "Unread" in order to have it appear in your "Unread Content" stream later. 

Sometimes I read a post in a thread but I do not have time to respond and want to come back to it later in the day or week. On large and active forums with many posts it is sometimes hard to find a post that you wanted to come back to because there has been so much content that has filled up the forum.

Another way is to possible have a personal folder called "Favorites" in each person's profile that they can save their favorite threads so they can refer to them later.  This would solve the issue of being able to come back to it later and also be able to archive your favorite posts for reference at a later time.

Thanks.

How about this?