What Would You Lose If Your Gmail, Flickr Or Facebook Were Deleted?
Link: Look After Your Data - What would you lose if your Facebook, Flickr or Gmail were deleted?
Guides detailing how to download a copy of your data from a range of websites.
Full list of websites with guides:
Uncategorized Pages, All Google Products, Basecamp, Blogger, Delicious, Facebook, Flickr, Friendfeed, GMail, Hotmail, Photobucket, Picasa, Twitter, Windows Live Mail, Wordpress, Youtube, Zoho
Pages can be annotated/edited to include you thoughts.