Google UK's homepage links to Gmail: "Free email with 2.8GB storage and less spam. Try Google Mail (BETA)." If you click on the link, you'll be sent to a different template of Gmail's homepage:
The top reason for choosing Gmail is you'll get less spam. "Users say that less spam is one of the top reasons that they love Gmail." It's interesting that Gmail's storage is not that catchy anymore, now that other webmail services have similar or even bigger storage quotas.
Now that Gmail has become more available and will go public pretty soon for everyone, my question is: why would you choose Gmail now?