The fortunate end of that case is the content is already in place—the users, the sites, the tools—and all that is left is the connective tissue. While that unification is taking place, Yahoo will also be accommodating custom apps to run across its network. Developers will be able to connect properties and feed data wherever they'd like. Want to see your Flickr photos on your del.icio.us page? Play a card game next to your sports news feed? The possibilities are, well, open.