a good way to save space in your time machine disk

Hi there, like every mac os x - leopard user in the world should do, i use time machine. this great program let's you automate your backups. it is easy to configure, just plug an external drive, confirm and enjoy.
For people trying to optimize the space in the time machine disk there are some important things regarding some folders that are good to exclude from the backups. I have found this information from this blog. Here they are:

• /Applications
• /Users/[user]/Library/Caches
• /Library/Caches
• /Users/[user]/Downloads
• /Users/[user]/.Trash
• /.Trashes
• /Library/Audio
• /Users/[user]/Music/iTunes/iTunes Music/Podcasts
• /Users/[user]/Library/Mail Downloads
  

I exclude this folders, because this information does not hurt if it disappears. please read this blog for more explanation.