I have a list of pre-defined texts/pictures. I wish they can be posted on my web site one after another as a 'latest posting' every hour or so. Since there are dozens of such texts daily and they should not be displayed all at once, I wish this process can be automated rather than a human uploading new data every hour. Might there be some web software that already does this? Best an existing extension for popular CMS. Can RSS be submitted in this incremental and automatic fashion? Thanks

Wordpress supports it natively - just write your posts as normal but set the "published on" date to some time in the future. It'll be published then. Good for something semi-regular (say, a daily or weekly blog entry) that you can queue up a few in advance for. Not sure about every hour though, you might want to see if there's a plugin that would be better for that kind of volume of data.

Looks like it does. Thanks. Perhaps I would use it until finding other CMS supporting such feature.

The downside of course, is there are not as many plugins/extensions for it, or these extensions are blog-centric. I don't think people use wordPress to publish a large, membership-based based site like gamedev.net for example.

Perhaps another option is to find a CMS system with the most friendly plugin system and develop one.