These include:
- utility and safety macros
- bnode serialisation
- URI processing (e.g. strip-mailto)
- unique node/URI utilities
- shortcut parsing (rdf->db)
- Concise Bounded Description functionality
- pcase, a macro for doing case-like switching over properties.
You should read the code to find out more.
Announcement for 0.2.1, released 2005-09-11: here.
You might also be interested in the highly-hacky wilbur-maker.
ASDF-install package (obsolete) http://www.holygoat.co.uk/projects/wilbur-ext/wilbur-ext.tar.gz