If you want, you can update to 4.1 for the latest bugfixes and features. It isn't necessary though. Take a look here for changes to the System Menu.
Two small changes:
- Priiloader is now a requirement even if you have Bootmii as boot2, because there isn't a point to this guide if updates aren't blocked.
- Added Tealc to "Thanks to" section. I used his "Which IOS Games Use To Run" guide for the "Update All Game IOS.zip" pack.
I hadn't thought about how many people were going to need (some) IOS's updated after Christmas. The past week there were between 5 and 10 downloads a day. Today there have been over 60. I wonder what tomorrow will be like.