When it comes to must-have tools installed on my desktop, laptop, tablets, and phones, Dropbox is close to the very top of the list. Having access to your data anytime, anywhere, from any device, is an absolute godsend, and anyone who isn't yet using Dropbox is missing out on an insanely useful service.

For those who are using Dropbox, though, you probably know how easy it is to score some free space by getting your friends to sign up for the service with your referral code. Up to this point, you've been able to garner an additional 8GB with your free 2GB account, for a total of 10GB. Now, though, Dropbox has decided it would be a good idea to double that number, and we all tend to agree - more free storage is better, after all.

Beginning today, all referrals for free accounts are worth 500MB each, and 1GB for pro accounts. Since the amount per referral has doubled, so has the amount of total storage: 16GB for free accounts and 32GB for pro accounts. All free.

Here's the best part, though: if you've already maxed out all of your referrals (as I have), this promotion is completely retroactive. Give the DB team a few days, and you'll see that you have around 8GB more cloud storage. For example, I now have 24GB of Dropbox space. And that's just awesome.

So, if you haven't already, it's time to start sharing that referral link.

[Dropbox Blog]