For questions I'd like to keep an eye on (e.g. to see if anyone else posts an answer) is there a way to maintain a list of such questions other than adding them as favourites or using the RSS feeds?
I second this very, very much. My favourites list is so full that it does not serve the purpose of keeping track of questions anymore. I'm sure everyone comes across questions every day where they'll think "I'd like to know the answer to that, too". You upvote it, favourite it, and forget it, until you clean up your favourite list a year later.
A notification feature informing about a question getting an accepted answer (or any other status change, like a bounty and maybe even a closing) would be very, very helpful indeed.