Linode: Transfer is $0.10/GB, CPU+RAM+HD is free
With most other services, you pay per GB transfered on top of the instance price.
For example, at Rackspace you pay $0.22 (u/l) or $0.08 (d/l) per GB transfered, which goes on top of the instance price, about $44 per GB of RAM.
At Linode, you get 400GB of transfer included in a 1GB RAM instance.
Or, looking at it from a different angle, at $40 an instance, that's $0.10 per GB transfered, pretty much the same rate as other services (the rate remains at $0.10 if you need more than what's included).
If you notice that $0.10/GB is roughly the standard rate for transfers across all cloud hosting services, at Linode you are basically getting the physical instance (CPU, RAM, HD) for "free".
DISCLOSURE: I am not by any means affiliated with Linode, Rackspace, or any other cloud hosting service. I'm simply a customer with a probably not-so-exciting epiphany.