The compact Canon Digital ELPH series is bulking up; perhaps not as apparent in size, but definitely in megapixels. The Canon PowerShot SD500 has 7.4 total and 7.1 effective megapixels on its large 1/1.8-inch CCD. Besides upgrading the amount of megapixels in this series, Canon redesigns the SD500’s compact outer shell. Retaining a slight 3.37 x 2.24 x 1.04-inch form, the SD500 adds a comfortable rounded edge to its right side. This “Perpetual Curve Design” departs from the sharp 90-degree angles distinguishing earlier Digital ELPHs. For $499.99, the SD500 offers automatic and manual options in an easy-to-use interface. The Canon PowerShot SD500 will be available beginning in March.