Digital Photography Review posted a review on the Canon PowerShot SD450 Digital ELPH

Announced in August 2005, the SD450 (which goes by the name of Digital IXUS 55 in Europe) is the latest in a long line of ultra-compact 'ELPH' or 'IXUS' cameras stretching back to early 2000 (and a lot farther back than that in the film camera world). Essentially a fairly minor upgrade to the popular SD400 (Ixus 50), the SD450 incorporates two UA (Ultra-high Refractive Index Glass Molded (GMo) Aspherical lens) elements which has allowed Canon to produced its smallest cameras yet to feature a 3x zoom. New features include a larger 'wide viewing angle' 2.5-inch monitor, a direct access ISO button, a nifty orientation sensor that rotates the display of images as you turn the camera round in playback mode and some fancy playback effects.

Canon PowerShot SD450 Digital ELPH Review