An update to the PSP system software was made available today and it includes the following changes:

NETWORK
★ Support has been added to allow remote play (connect a PSP system to a PS3 system) over the internet in [Remote Play].
★ [Communication Settings] has been added as an option to the [Remote Play] menu.
★ [RSS Channel Guide] has been added as a feature under [RSS Channel].

UPDATE NOW AVAILABLE:
PSP Firmware 3.50: Japanese | US | European | Chinese | Korean

Using remote play outside the home (via the Internet)

Remote play communication settings

RSS channel guide