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punypng is a free optimization service that can dramatically reduce the file size of an image by converting it into a highly-compressed, lossless PNG image. Whether you have a GIF, JPEG or PNG, use punypng for outrageously fast page loads and help make the web more puny!

Converticon is a simple icon utility. It can import ICO, PNG, GIF, and JPEG formats and export to high-quality PNG or ICO files. There is no software to download and it's 100% free.

ImageAlpha is a GUI for pngnq and pngquant. It allows you to easily generate paletted PNG images with full alpha channel and test how it will look against different backgrounds.

Moving Sonic the Hedgehog to the right caused the foreground to move past the camera to the left faster than the background, creating a faux-3D view of Green Hill Zone. We can create a similar effect on a web page by fixing semi-transparent background images to different sides of the browser viewport, and at different horizontal percentage positions.

I mean Parallax Scrolling which is a technique often used in good ol' arcade and video games like Moon Patrol or Sonic the Hedgehog. In such 2D games parallax scrolling was used to create an illusion of three dimensional depth.