But 2gb sounds like a lot and 32mb sounds like nothing. When a service like rackspace _starts_ at 256mb you wonder just what you are getting.
What you're getting is the ability to deploy linux containers with very fine-grained control over resource allocation. Maybe you're using redis as a job queue, or to hold a handful of counters. Maybe you're running nginx to serve static assets with custom rewrite rules. You can run it dotCloud and pay peanuts - knowing that you're one "dotcloud scale" away from all the gigabytes of ram you can eat.
Yes - exactly like dotCloud's sandbox :)
Except Gmail isn't just free for drafting emails, it is free when you send them to real people too.
dotCloud doesn't have ads, to pay for the service like gmail. :)