Folksonomies of the Internet

In recent years, we have seen software companies such as flickr, stumbleupon, 5by, 43things, etc.utilize crowdsourced social tagging to change the way we browse the web. What do you think about the future of "Web 2.0"? Is it likely that there will soon be a platform for "finding things without looking", similar to that of StumbleUpon? Would love to hear your thoughts and opinions!