Updated:  Added EditGrid.com, see the end of this post for detail
wikiCalc yet another web based spreadsheet managment program which is a part of SocialText . Enables you to do your spreadsheet stuff on the web. Similer as google spreadsheets which just introduced from google last week.
The wikiCalc program is a web authoring [...]

Just went to HubDog. Hubdog is a web browser toolbar allows you to generate media channels with any content feed available on the web (XML, RSS, Atom)! Instead of visiting a website over and over for updates, Hubdog Toolbar automatically fetches all your favorite content feeds, puts them into personalized channels, lets you view [...]

The Google data APIs ("GData" for short) provide a simple standard protocol for reading and writing data on the web. GData combines common XML-based syndication formats (Atom and RSS) with a feed-publishing system based on the Atom publishing protocol, plus some extensions for handling queries. GData is a new protocol based on Atom 1.0 [...]