GigaOm reports that:

Dropbox introduced a new version of its desktop client Friday that comes loaded with an upgraded version of its file-sync technology. It now includes the ability to stream so that big files like video or audio can be retrieved by users faster.

This means that if you use Dropbox to store large files (think of home movies), you’ll be able to view them without experiencing the lag that normally occurs when you click play on almost any web service. The same technology is also used by Netflix, that in fact allows you to watch movies without downloading them to your computer.