Archivemount is a piece of glue code between libarchive
(http://people.freebsd.org/~kientzle/libarchive/) and FUSE
(http://fuse.sourceforge.net). It can be used to mount a (possibly compressed)
archive (as in .tar.gz or .tar.bz2) and use it like an ordinary filesystem.

WWW: http://www.cybernoia.de/software/archivemount/