This camera is ancient. We recommend that you go with a much newer model like the Canon SX20. Here's what we had to say about the S3 when it was released way back in February 2006:
Canon's extended zoom camera gets a bit of a makeover. An update of the S2IS, the S3IS is a sleek camera with a cool, gun-metal grey paintjob that says this camera is here to do business. The 6 megapixel sensor and 12x optical zoom combine to create tremendously detailed and versatile images, all kept in line by Canon's powerful image stabilization technology. The S3IS also has a strong video mode as well, offering 30 frames-per-second and stereo-sound that Canon claims can rival even standard camcorders. The S3IS is a serious camera with plenty of functionality, perfect for those who want not just long-range photographs but a long-range experience.