You're right, it will be useful on the web. Sebastien just included the search field on the forum for a first test. (It's not graphically tuned yet ^^)
Laurent&Seb might have a look for documentation as well.
For eclipse, I think we have a different understanding... I imagine something like firefox, with the search not really inside Eclise. Or maybe just the search file inside Eclipse, bu then lauching a browser.
To get the idea, lauch firefox => menu "?" => "Firefox Help"
It goe straight on http://support.mozilla.com/fr/kb/Firefox+Help?style_mode=inproduct , in a new tab.
What do you think about something like this in Eclipse ?
(BTW: I included the JIRA as well in the search)
In my mind, because of its web nature, it should be better on the petals website or on the documentation home page, searching through documentation, forum, blogs, ...