Dropbox is a great cloud storage tool — I’ve been a big fan since it launched in September 2008. I have considered defecting and tested several others but I always come back to Dropbox’s simplicity and reliability.
Currently a free account comes with 2Gb of space, but you can increase this by recommending others. Now Dropbox are offering up to another 5Gb free (for Android users only).
So how do you get the extra space?
Firstly, you need to agree to test their lastest beta software on an Andorid phone. They have developed a tool to automatically upload your photos to your Dropbox account and as an incentive to test this you will receive 500Mb of space. For every 500MB of photos and videos automatically uploaded, you’ll receive another 500MB space bonus, up to 5GB total.
If you are interested, see the Dropbox forum post for more details
UPDATE: A new offer is on the table for 3Gb of free Dropbox space