Lot of news about Xfce4-Appfinder
Now it is a GTK Widget featuring:

API
// Is our widget an appfinder?
XFCE_IS_APPFINDER()
// CAST to appfinder
XFCE_APPFINDER()
// Appfinder widget creation
xfce_appfinder_new()
// For searching a pattern into appfinder widget
xfce_appfinder_search()
// Enable/Disable the category tree
xfce_appfinder_view_categories()
// Restore the original tree
xfce_appfinder_clean()

SIGNALS

// Emitted when double clicking on the apps treeview
"application-activate"
// Emitted when right clicking on the apps treeview
"application-right-click"

Featuring also .desktop file caching and ordering by name
Please test out SVN Trunk!

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