If you're looking to improve on Windows Explorer (and who isn't), give FilerFrog a try--it offers many features that you'll wish had been built directly into the operating system. It works as an add-in to Windows Explorer--right-click a file or folder, and FilerFrog appears on the context menu, giving you access to a wide variety of new file- and folder-management features.
The full feature list is far too lengthy to mention, and some you may never use. But plenty of others, you'll find quite useful. If you want a better way to manage images, you'll be able to quickly resize any image, as well as create your own album of images. You can encrypt files to keep them private, and then decrypt them. Want to rename multiple files in one fell swoop? FilerFrog makes that a snap. There's more as well, including the ability to split files and rejoin them, and a faster way to move and copy files.