Bucketlist.org - Log and catalog all the stuff you want to accomplish before you expire.
Octopress - A static blogging framework for hackers, based on Jekyll
List Challenges - Earn points for your life experiences. Find lists that interest you, and mark off what you've done.
Rememble - Rememble is a 'washing line' for your digital bits and pieces.
Life Listr - ***AS FEATURED BY APPLE***
DonorPerfect - Nonprofits use DonorPerfect Fundraising Software for their Donor Management, Grant & Gift Tracking, Moves Management, Mass Mailing needs and more.