Easier browsing

A suggestion i want to make is a button that takes it to the last post you read. meaning, if i read a thread at 12 pm and i wanted to read it again, but dont want to reread everything, i would click that button and it would take me to the most recent post since i viewed it last... makes keeping up on things easier because you can know what you have or havent read. it would just go to the first post that wasnt there when i last read it... definitely useful in keeping up with threads.. just a thought