Firefox ODFReader extension
A Mozilla Firefox extension has been proposed by a developer named Talin, according to Mozilla hacker Gervase Markham [1]; since then it has been further modified by Alex Hudson[2], and was hosted in the official Firefox extension repository[3].
Official page for the ODFReader extension:
Mozilla Firefox Extension Add-on page
Development resources
This plugin requires the use of an XSL file. Currently the author recommends using the XSLT provided by J David Eisenberg:
Also check out David's book OASIS OpenDocument Essentials
And for Firefox / XUL development, you can check out the book Rapid Application Development with Mozilla by Nigel McFarlane:
Note: It should be noted that Google has already supported viewing SXW format (used by OpenOffice.org 1.x) as HTML through their search engine[4] and G-Mail[5] already.