FreeFree, duh
Access to support forum*
Unlimited domain uses
Access to free themes
PremiumTBA / Year
Access to support forum
Unlimited domain uses**
Access to free & premium themes
1-2 new themes per month
Unlimited theme updates***
PSD files when available
* Subjected to change at any time.
** The domain/site have to be owned by you, the unlimited usage includes WordPress multisite installations.
*** Currently you need an active premium subscription to get the updates.