Sony announces the new Sony PSP firmware 5.00. The firmware 5.00 brings a Playstation Network icon to the XMB and you can now sign up for PlayStation Network, manage your account and access PlayStation Store directly from your Sony PSP.
This new feature in firmware 5.00 enables you to directly download games via Wi-fi from the Playstation store onto your PSP.

Sony is taking down the Playstation Store on the PC for some redesigned. It will be relaunched soon. The Sony PSP firmware update 5.00 adds also a sleep timer option that can be used while you are playing music on your PSP. In addition, Sony added a full screen keyboard option for text entry and redesigned the background of the XMB.

The new firmware for the PSP should be available soon.
Via the official Playstation Blog.