I have coded a Beagle web interface for MonoRail. It let you search keywords inside documents, IM conversations and other files in your hard disk. Beagle rocks :-). It uses Beagle.dll instead of doing system calls and the code is pretty simple. It is based on beagle-search (Gtk#). This is the controller code, and this is the QueryWrapper class
You can download a tarball contaning all files including Makefile here. Dont forget to export MONO_PATH variable pointing to the place which contains Beagle.dll and Util.dll