| Storage | Price (per year) |
| 20 GB | $5 |
| 80 GB | $20 |
| 200 GB | $50 |
| 400 GB | $100 |
| 1 TB | $256 |
| 2 TB | $512 |
| 4 TB | $1024 |
| 8 TB | $2048 |
| 16 TB | $4096 |
Here's some historical data:
Pricing (August 2007)
| Storage | Price (per year) |
| 6 GB | $20 |
| 25 GB | $75 |
| 100 GB | $250 |
| 250 GB | $500 |
Pricing (January 2009)
| Storage | Price (per year) |
| 10 GB | $20 |
| 40 GB | $75 |
| 150 GB | $250 |
| 400 GB | $500 |
Google says that the storage is shared between Gmail and Picasa Web Albums, but it's obvious that the additional storage will mostly be used in Google Docs, when the service morphs into Google Drive.
"While storage costs have been dropping naturally, we've also been working hard to improve our infrastructure to reduce costs even further. Today, we're dramatically lowering our prices to make extra storage more affordable. You can now buy 20 GB for only $5 a year, twice as much storage for a quarter of the old price, and enough space for more than 10,000 full resolution pictures taken with a five megapixel camera," explains Google.
If you've already purchased Google storage, there's a good news: "Your total storage will be increased according to this page at no extra cost. For example, if you had previously purchased 10 GB of Google storage, you now have 80 GB available."
I wonder how much free storage Google Drive will offer when it's released.