I just released version 3.1 of the Spotlight & QuickLook plug-ins. The QuickLook previews should be more accurate now, largely thanks to a new libwpd version (0.9.1).
Under Spotlight, text boxes and comments for non-Mac WP documents are now indexed. For WP Mac 2.1 to 4.0 files I retained the previous engine because it is about 170 times faster than libwpd. However, this could be changed depending on how important text boxes and non-Western scripts are as weighed against the indexing speed.
Also, if there is interest for Leopard Intel or Leopard/Tiger PPC support, that could also be changed depending on the needs.