Together as one, and leaving behind a smaller memory footprint is plum's Spoofer version 0.7.1. "Spoofer" is a plugin consolidating both the features of Davee's Unlimited Character Version and Mac Address Spoofer and Total_Noob's DayViewer.
The Unlimited Character Version and Mac Address Spoofer lets you change the "MAC Address" string and other strings found under [System Settings] > [System Information]. It's useful for hiding your MAC address when making videos ... if that matters or not. It doesn't actually spoof the packets sent across your network ... I don't think. And DayViewer lets you format the XMB date & time string to whatever format you want -- you're no longer limited to the 3 default formats (YYYY/MM/DD or DD/MM/YYYY or MM/DD/YYYY).
Note: You'll probably want to pass the "ReadMe.txt" through Google Translate or some similar translation service -- it's in Japanese.