Amazon's S3 storage servers are some of the cheapest, biggest and most secure around and Jungle Disk Desktop Edition allows you to save files to them in a few clicks.
Jungle Disk Desktop works across platforms, so it's ideal for those that have to store data remotely using both OS X and Windows. To use it, you simply drag files into it with Finder. When you do so, the file is encrypted and uploaded in the background on Amazon.com's servers. When you install it, you have to go through quite a lengthy sign-up process which involves signing up for both a Jungle Disk and Amazon account.
There is also a 2$ per month fee to pay but the storage fees are very competitively priced. It costs $0.15 per GB-Month of storage used, $0.10 per GB of data uploaded, $0.17 per GB of data downloaded, $0.01 per 1,000 upload requests and $0.01 per 10,000 download requests. This makes it an ideal utility for software developers uploading a program that receives a high number of downloads.
It's a shame it's not free to use but the cost of Jungle Desktop Server is modest for what is a very easy to use and cost effective way to store large amounts of data.