The Google data APIs ("GData" for short) provide a simple standard protocol for reading and writing data on the web.
GData uses either of two standard XML-based syndication formats: Atom or RSS. It also has a feed-publishing system that consists of the Atom publishing protocol plus some extensions (using Atom's standard extension model) for handling queries.
"The goal of the project is to create an open source software product. The product we're making is a wiki engine, but where most wiki engines are geared toward pages of text, OpenRecord is geared toward loosely-structured database content."
Lightweight but rich data grid with resizable columns and a scrolling data to match the headers, plus an ability to connect to an xml based data source using Ajax to load the content.