I configured ripperX to use musicbrainz' freedb gateway <http://freedb.musicbrainz.org:80/~cddb/cddb.cgi>.
When I insert a CD that has track names with accented characters these are displayed wrong.
Example: CD Vagabondo of Gruppo Spontaneo Trallalero, track 3
ripperX (wrong): Mamma dimmi perchAc
SoundJuicer (correct): Mamma dimmi perché
MusicBrainz' freedb gateway uses UTF-8 and recommends using a client that supports protocol version 6, see <http://musicbrainz.org/doc/FreeDBGateway>
I used RipperX v2.7.2 on Ubuntu 10.04 (lucid).