Preloading images is a great way to improve the user experience. When images are preloaded in the browser, the visitor can surf around your site and enjoy extremely faster loading times. This is especially beneficial for photo galleries and other image-heavy sites where you want to deliver the goods as quickly and seamlessly as possible. [...]

File Sync

Dropbox allows you to sync your files online and across your computers automatically.

Work on files in your Dropbox even if you’re offline. Your changes sync once your computer has an Internet connection again.
Dropbox transfers correctly resume where they left off if your connection drops.
Efficient sync: only the pieces of a file that changed (not [...]