Tag everything!

How many things can I tag?

• I can tag my email
• I can tag pictures on the web with flickr (and others)
  
• I can tag pictures on my local disk (and on the web) with Picasa
• I can tag web sites on deli.cio.us (and others)
• I can tag and rate songs with my favorite media player
• I can rate movies and books through Amazon, Netflix, Blockbuster etc.
• I can tag files on disk, to varying extents, depending on my operating system
• I can tag entries in my calendar, depending on my calendar app

It would appear there's a bit of consolidation to be done ...