One of the new things other than clustering in Openfire Enterprise 3.4 is a new release of SparkWeb. This marks a number of major transitions for it:
First, it's now built into Openfire Enterprise. No more downloading a separate plugin, and no configuration required. You'll find it in a new sidebar item in the "enterprise" tab of the admin console.
Moving to Flash
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Work In Progress
There's good and (temporary) bad with this transition. The new code supports vcards and avatars, and is significantly smaller, resulting in quicker page loading. There's also a revamped UI, including contact list filtering much like Spark has. On the other hand, group chat support and secure connections are not quite ready in the new code, and are planned for the next minor Openfire Enterprise release.
If you have any questions or problems, feel free to post them in the Openfire Enterprise Support forum