That's why you (in addition to all that has been said) should make very clear how easy it is to up- and downgrade.

Also there could be small hints next to the slider (yes, I'm a fan of sliders;)) as it snaps into the various positions...

But those are again just ideas. You should get a good designer on the case, this is their bread & butter.

That's easily solved

Have a slider. When you move it have a window that lists what applications can be served with the selected allotment.

Hell... that'd be pretty damn cool looking

Most people don't know how much disk space an email takes, it didn't stop Gmail from just giving 2gb free disk space.

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. :)