Minus is primarily a web application, with a spiffy HTML5 drag-and-drop uploader. Just drop a file onto the page, copy the link and share. Couldn’t be simpler.

There are applications for OS X, Windows and Linux (as well as mobile phones and tablets) that allow you to upload files without loading up the website. The desktop apps work by allowing you to drop a file onto an icon.

Minus is free for now, but they have some limits in place. Files can be no larger than 200MB each, but there is no limit to the number you can upload. If you upload a lot of small files, Minus could certainly be a more attractive option than CloudApp, which only allows 10 uploads per day for free accounts.

If you’re looking for a way to quickly share files with people, Minus is worth a look. Even if you don’t need it very often, it’s a great tool to keep in your arsenal.

Your files are stored on Amazon S3, mirrored across multiple servers and facilities, so it’s very unlikely that you will have any data loss issues.

One interesting part of the application is its extensibility. You can install a number of “Raindrop” plugins that allow the app to perform different actions when you press the universal CloudApp keyboard shortcut. Perhaps you’re in iTunes? Pressing the key combination will upload the selected songs. Photoshop? The current canvas will be uploaded. Firefox, Safari, or Chrome? A short URL for the current web page will be generated.

The service only works on Mac OS X for now, but there is a REST API, so it’s entirely possible for someone to write a Windows or Linux client.

CloudApp is in public beta, and the developers have not implemented any visible means of monetization. My guess is that it will remain free, but I do wonder how they intend to sustain their service. Ads on the web page? Premium plans?