Is it possible to combine RSS feeds and other stories in the same view?
Can you give more details? Do you mean importing a feed into your website and then displaying its contents alongside your own? You'd need the Feeds module to do that.

UPDATE: Yes, this is possible. You need the Feeds module, and to create a content-type to hold the feeds. When displaying your view, use Filters to narrow it down to just your user-entry content-type and the Feeds-info content-type, and they will both display (in whatever order you set, the default is posted date).