I've got a similar noise on mine.  Except mine is coming from the
right front and is most noticable when turning left. I'm about 80%
sure it is a wheel bearing.  I've visually inspected all the CV boots
for cracks and they look like new.  I can't find any slop in either of
my joints either.

And speaking of bearings....  I just replaced both wheel bearings on
the rear of mine.  The right rear was starting to make some noise.  I
also tried the "jacking and wobbling" trick on the rear wheels and
they were tight.  While a sloppy bearing is certainly an indication, a
tight one doesn't mean all is good.

Matt
00 Focus Wagon (w/95,000+ miles)