Ubuket works under Adobe Air's runtime environment and will allow you to effortlessly share your YouTube videos or your Picasa Web Album photos, for example, with your friends.
The only requirement is that both you and your friend have a Ubuket user account. From there, the application will guide you through the process of sharing multimedia content with your contacts.
For the moment, Ubuket supports Picasa Web Albums, YouTube, and Seeqpod, and others such as Flickr or Last.fm are soon to be added.
Requires Adobe Air.