Paste a link to any web-hosted file into web app Burnbit, and it'll turn the file into a torrent you can download and share with other people — particularly handy for quickly sharing large files with multiple people.
So why and when might you want to use Burnbit rather than just using a regular http-based download link? For starters, it's a good option if the server you're downloading from is particularly slow. When you create a torrent using Burnbit, your torrent download will still download the file from the server, but it'll also download from any other user grabbing the torrent. So in theory, your Burnbit downloads should always be at least as fast as the regular download. Alternatively, if you're trying to share a large file on your own servers and want to save a little money on the bandwidth, distributing the download via BitTorrent can make a big difference. The nice part about Burnbit's integration with both BitTorrent and the web-hosted file is that the torrent will always have at least one seeder — your server.
It's not necessarily an everyday-use app, but Burnbit is a very clever idea that could come in handy in the right circumstances.