Dropbox has increased (and doubled) the amount of free storage space they are offering for referrals. Effective immediately, if you refer someone to Dropbox and they sign up for an account — you will get 500MB (previously 250MB) of free space. And nicely done, not only will you get the 500MB of free space for referring, but the new user will also get the same 500MB bonus for signing up using your referral link. The referral system will allow for 32 invitations per account which means you can get up to 16GB of extra space for free. That being said, if you are a Dropbox user you can find your referral information by logging into the Dropbox.com website and clicking the link for “Get free space” which can be found in the upper right hand corner.
Via [Dropbox Blog]