Hi,
I am not really sure how you have things set-up, but it sounds like you already have sometype of web-site in place.
If i wanted to do something like this i would store the information in a database and then have something that would check todays date agains something in the database and see if anything new is set to go live.
For example.. you could have something that would like all gallery's/storys in a database using a timestanp. Everything someone wants to check the sorty's or gallerys it would do something like "select * from mytable WHERE timestamp < today's date".
Then you just have to add the records to the database with a timestamp in the feature.
later
- Justin