I'd like to be able to keep track of a post that interests me, while not actually posting (since I have the same question, and nothing useful to actually add.) Since I can get email notification of my questions and answers, would it be possible to add a 'watch this topic' option somewhere?
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I'm experimenting with change notification on your favorites. I deployed a change on meta/su/sf where you will be notified of any changes to your favorites.
So as of now, there are four things you get notified of:
(Additionally, you'll note that you can sort your favorites by "recent" which will put the ones with the recent activity at the top.)
Currently there is no functionality within the Stack Overflow engine to accomplish what you desire.
There is a way, however, to achieve close to the desired result using RSS. You can subscribe to the question RSS by clicking on the "Question Feed" button at the bottom right of the page.
As an alternative you can favorite the question using the little star underneath the voting section. This however, doesn't provide updates and must be manually managed, it can get out of hand when you've got many favorites.
Shameless self-promotion, but I am working on an API app that you may be interested in:
It is currently still in development, but I am glad to hear that I am not the only one who wanted this functionality :-)