Gateways

• Netvibes: A double-sided portal that allows for public and private views, as well as friending associates.
• iGoogle: A personal page with no external web presence. Content can be organized into tabs, Google App integration is a plus.
• Mahalo: A human edited search engine, with the goal of having 10,000 handcrafted result pages for the most popular topics. Firefox toolbar allows users to create user and topic pages.
• Shyftr: RSS reader that allows users to share and comment on each other's feed items.

Random Cool App

• PicLens: Image browser plugin for Firefox

Microblogging

• Twitter: Still the most popular microblogging platform around, twitter has battled uptime and performance issues almost since it's creation.
• Jaiku: Purchased by Google, it's the lead competitor to Twitter. It allows replies to posts, which gives rise to threaded discussions within the site.
• Pownce: Microblogging combined with file-sharing.
• Digsby: Desktop client for tracking instant messages, email and social network updates.

Productivity

• Google Docs Create documents online, edit them in real time with other people, create forms that feed Google-powered spreadsheets, and use data in spreadsheets to display graphs on a web page.
• Evernote: Sychronizable note-taking system for Mac, Windows and mobile devices.
• Twidda: A team whiteboarding application, allows people to chat and talk in real time, draw on the canvas, and co-browse web pages.
• Voicethread: Creates group conversations around images, docs and videos.
• GrandCentral: Voicemail tools.

Social Networking

• Facebook
  • Games: Slayers vs. Zombies vs. Pirates
  • Outside Apps: Del.icio.us, GoodReads
• GoodReads: Similar to LibraryThing, GoodReads networks like-minded bibliophiles. Readers can place their books on a variety of shelves, write reviews of those books, and create discussion groups.
• SocialThing: A social networking aggregator that combines posts from services such as Facebook and Twitter into a single timeline