One thing you guys neglected to think about was the html catalog, going all fancy can have a nice impact on customers user experience but not at your marketing expience, especially if you rely on the html catalog for search engine placement.
I've written a not-so-fancy php version similar to this, there is no mouse over flyouts or dhtml involved, its complete html catalog friendly, and will even keep a tab on where the user is by the var $cat so the user can easily see what category they are in while browsing products, etc. It works only on a 2-tier or 3-tier tree.
If anyones interested PM me for a demo url, this mod will be on cartlab for sell soon
