I understand what Alexander is talking about as I also find it a little difficult to track answers to posts and often they are not even my posts but someone else's that I happen to be interested in.

However, I can think of no reasonable way to notify a user that his comment has been answered, that additional comments follow his latest post or that additional posts have been make on a particular page.

A link to 'notify the commenter' (similar to the quote button) may be useful but I also worry about abuse.

I use a simple WORD document to track pages I want to visit again. I copy the page address and paste them into the document. That gives me quick access to those pages I am most interested in. I delete them when I am done with that page to keep it current. Its cumbersome and takes time but it works.

What worries me more is that once a vehicle has been identified (correctly or incorrectly) visits to that page and/or additional comments may be overlooked. This is particularly true on a busy day when a comment may be on the 2nd or 3rd page of the most recent comments and may be easily overlooked.