How can I view only the bookmarks of a certain file type (MP3, PDF, etc.)?
For certain kinds of bookmarked URLs, Delicious automatically creates special tags to make them easier to find. To see these bookmarks, simply enter the applicable tag into the tag bar. Here's a list of them.
Audio items are automatically tagged system:media:audio. Audio items with a ".mp3" or ".wav" extension will automatically be tagged system:filetype:mp3 and system:filetype:wav respectively.
Video items are automatically tagged system:media:video. These include system:filetype:mpg, system:filetype:mpeg, system:filetype:avi, system:filetype:wmv, and system:filetype:mov.
Images are automatically tagged system:media:image. These include system:filetype:jpg, system:filetype:jpeg, system:filetype:gif, and system:filetype:png.
Documents are automatically tagged system:media:document. These include system:filetype:pdf and system:filetype:doc.
Multimedia filetype RSS Feeds
http://delicious.com/help/faq
Audio and video tags also automatically generate an RSS-with-enclosures feed. So if you're looking at a page of bookmarks tagged with system:filetype:mp3, the RSS feed for this page will include code that podcast readers can subscribe to just like any other podcast.
