Content Management Systems (CMSs) help create identity, community and collaboration, and Rich Site Summary (RSS) automates and fosters communication within and between these identities and communities. If CMS-based websites are like silos of knowledge on specialised issues, RSS is like the wind that blows between them, cross-polinating all the ideas, people and communities along the way. Aaaaaahh... sounds del.icio.us to me.
"Podcasting" (a.k.a. Personal Option digital, a.k.a. audio blogging) is to radio and other multimedia as blogging is to text. It would be a simple matter to enable Drupal to play a role in this exploding desktop audio publishing phenomenon.
Outside of North America people use SMS (short messaging service) like crazy! In many parts of the world this cell-phone based text-messaging system is the only one that's readily available. There's no question that there's a long list of real world applications just waiting to be developed based on importing and exporting SMS messages to and from cellphones and websites.
I think that Drupal is very well placed to take advantage of this opportunity as a result of both its increasing use in and among advocacy and community-building circles, and the modular nature of the code.
The first item on my Drupal Wishlist is CreativeCommons licensing to be integrated directly into Drupal. Not only would this enable users to select and associate appropriate liscences for and to their works, these liscences would allow content producers to follow the propegation of their works across the internet as they get exported through RSS/XML feeds.
On another level, I have no doubt that this has huge potential to signicantly leverage the credibitily that Drupal has established as a powerful technical tool within advocacy and community building circles.
One of the important limitations of Drupal over the years, especially from the perspective of somebody living and working in Quebec, Canada, has been its inability to manage multilingual content in any comprehensive way. Hopefully, all of this is about to change.