Hi,
Yes and No,
At this moment the phone service can only be unlocked with a special additional card underneath your regular SIM to pretend you have a valid SIM.
The rest of the phone you can unlock. This is also valid for the iPod Touch:

You can Activate iPhone and iPhone 3G
Jailbreak so you can execute 3rd party software
Removing of signature checks of applications
Unlock background network connections
Unlock the ‘download’ function in Safari
Nintendo NES Emulator
Installation of Cydia & Installer
Ad blocking in Mobile Safari
All old and future Firmware is supported
and more...

Also all PSP's can be unlocked!

If you are interested or like to have more info, let me now.
Cheers