tonstegeman's blog: "This post describes an issue we were having using the SharePoint PageFieldFilter webpart in combination with a Lookup field. First the issue is explained, then a solution is provided."
You can find a WSP file containing a working version of the webpart. If you don’t know what to do with a wsp file, start looking at Chris Johnson’s blog, or use the SharePoint Solution Installer. Attached to this post, you will also find the full code for the webpart. Both are in the same ZIP file. Do whatever you like to do with them, but please let me know if you use them and what you think of it. Might give me some ideas to improve it. Enjoy!