"The idea is simple, take tweets and thread them together to form conversations, adding context. This works by using the a tiny thread site to both start new conversation threads, and add your comments to old ones. After authenticating via OAuth, your comment is then sent back to Twitter, with a link back to the a tiny thread conversation page."

"As beautifully simple as to-do lists can get" (via boko http://friendfeed.com/boko/3c1771bd/im-3)

"group chat using the web, im, email or phone." "Chatterous - стартап из группы, финансируемой YCombinator, предлагающий моментальные Web-чаты для чего угодно - команды разработчиков, сайтов с группой поддержки, групп по интересам и т.д. К Web-чату можно присоединиться по почте (будет приходить оповещение с каждым сообщением), IM-клиенту, СМС или по Web-ссылке открыть в броузере, вот например." - александр.moskalyuk.name

"MagCloud enables you to publish your own magazines. All you have to do is upload a PDF and we'll take care of the rest: printing, mailing, subscription management, and more." It's Hewlett Packard's project. You can publish your magazine for free, minimal price for customers is $0.20 per page + shipping (USA only for now (x_x)). You can set higher price and earn money. Interesting service.

"When you click a BurnURL, the experience is a bit different than most shorteners. You'll see what we call the "ShareBar," which includes convenient links to share the story on popular social networks like Twitter, Facebook, and Digg, a hit count showing how many times the link has been visited, and options to vote the story up or down and see the overall rating from visitors. As you can imagine, all of these actions and data points create an opportunity to do lots of interesting stuff, and get back to something similar to the original ReadBurner."

No registration required.

"Our goal is to create a new kind of public service that enables local and global communities of people to think together by collaboratively building and editing comprehensive and succinct maps of complex debates that accurately present all sides of the debate from a neutral standpoint, free of repetitive clutter and 'noise'."

Craigslist housing data + Google Maps = this service.

"Edmodo is a private microblogging platform that teachers and students can use to send notes, links, files, alerts, assignments, and events to each other."

"Share content across different social media applications. Create publishing workflows that can be triggered by e-mail messages, instant messaging updates and third-party applications. Use our share form to easily publish content on several social media destinations, including twitter, Jaiku, Pownce and FriendFeed. Access a stream of all your activity and obtain a contextual meaning of your publishing actions." Now supports Evernote (automated note posting).

Commenting service

"Our HTML form builder helps you create contact forms, online surveys, and invitations so you can collect the data, registrations and online payments you need without writing a single line of code."