something like that, but in email form.
The idea is that the visitor can subscribe to ONLY what he wants and not a bunch of bombarding newsletters with all kind of content.
Example 1 “Category subscription”:
Visitor goes into desired category and there is no posts at the moment.
The pages shows “Looking for posts in %category%?” Subscribe to…
Example 2 “Query subscription”:
Visitor does the query (search or any other type of query) which brings out the specific URL. Again, “no posts for current search??, subscribe and be the first to know” etc…
I think it could be done with cronJob on daily or eve hourly basis. it goes thru all subscribed categories and links and checks weather there are new posts or not, and send out newsletters…
This would be very welcome for many sites where the posts flow is big… Aggregates specially…
Cheers!