Rounded Corners Rock!

"Rounded corners have become almost a standard design element in Web sites and application design; square corners just don't cut it anymore."

Andy Clark in Transcending CSS

Rounded

reduced to simple curves; made round.
fully developed, perfected, or complete; diversified and well-balanced (sometimes used in combination): a well-rounded education; a rounded character.

Corners

the position at which two lines, surfaces, or edges meet and form an angle: the four corners of a rectangle.
the area enclosed or bounded by an angle formed in this manner: sat by myself in the corner; the corner of one's eye.
the place where two roads or streets join or intersect.

Rock

to move or sway to and fro or from side to side.
to be moved or swayed powerfully with excitement, emotion, etc.
to dance to or play rock music.
(of popular music) to have the driving beat characteristic of rock.