Do you have Keynote2? Does the Web View feature not work for you? You insert a web view, but nothing at all happens? If so, thanks to this thread on the Apple Discussions forums, and ultimately a MacFixIt posting, there's now a solution to this problem.
The simple solution turns out to be deleting com.apple.internetconfig.plist from your user's Library/Preferences folder. Deleting this file does not seem to have any other ill effects, and web views should now work in Keynote 2.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20050207223437904