[Tagdb] RDBMS, Lucene or both?

[Ace Jayz]

I've been grappling with a design of a bookmarking/tagging system and I'm
leaning towards storing the tag data in an RDBMS so that I can answer fairly
complex relational queries efficiently (will probably use a 3-table schema
similar to that of Toxi), but I'm thinking about storing some data in a
Lucene index for efficient free text searching.  I looked back in the list
archives and noticed that a system based on a combination of a DB and Lucene
has been suggested here before.  Has anyone on the list implemented such a
system?  If so, care to share your experiences?  I've read some posts from
Otis G. about his Simpy system and I'm curious if it fits into this mold or
if it uses Lucene exclusively.  If Simpy is not an example of a tagging
system solely based on Lucene, does anyone know of a full-featured tagging
system that is?

Thanks in advance,
Ace.
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