2 Gigabytes not enough space for your Gmail needs? Fear not! Google will sell you more space! This is combined space for Gmail and Picasa and whatever else Google has. (Though it doesn't say anything about getting rid of the ads for paid users...
6 GB ($20.00 per year)
25 GB ($75.00 per year)
100 GB ($250.00 per year)
250 GB ($500.00 per year)
Me, I'm barely using any of my space there. 0.1 Gigabytes, actually.