PLAY, but they are all pretty terrible, imo.

It's a tie between 'Sweet 19 Blues' and 'PLAY'.

Ultimately I voted for "S19B" since it has lesser votes.

Why Queen of Hip-Pop has so few votes? I voted for it, it's my favorite cover, Namie looks so bad ass :P and I love the Pink Panther thing :P

Also Play CD+DVD cover is my second favorite.

PAST < FUTURE

but I think her best cover is BEST FICTION, way superior to all the others *o*

Update: for me the best cover is the cover of FEEL (Cd Only) followed by Concentration 20 and Sweet 19 Blues.
The most uninspired covers : Dance Tracks Vol. 1 and Uncontrolled

The covers for Uncontrolled are my favourites. She looks very beautiful and I love the placement of the light, it makes the pics look ~artistic~ and insteresting. The cover for Sweet 19 Blues would be my second favourite.