How to Upgrade iPod Touch to iOS 5.0.1 from Apple.com - How to upgrade to iOS 4 for iPhone 3G iPhone 3GS and iPod touch 2G and iPod touch 3G.you can upgrae but you lose your jailbreak and youll have to rejailbreak it and its alot easier now i just did mine simply go to jailbreakme[dot]com in safari on your 3gs and follow the instructions and itll jailbreak it without the computer.google ideviceunlocker on you ipod touch ipad iphone you dont need a computer its just like jailbreak me . com but it works for 4.1 and 4.2 message me if it works for you.
This backdoor uses a security exploit in the activation screen.
How to upgrade to iOS 5 for iPhone 4,3GS ,iPod touch 4G, 3G and iPad 1, 2:
Step 1: Download the iOS 5 IPSW file for iPhone 4 and iTunes 10.5 - Click Here.
Step 2: Install iTunes from the downloaded DMG file.
Step 3: Update your phone with itunes by connecting it and clicking on the "Check for Update" button while holding down the Option key (Shift on a PC). Select the iOS5 IPSW you just downloaded and confirm.
How to Activate iOS 5 without developer account
Step 1: Triple click the home button to activate Voice OverStep 2: Triple click the home button and Emergency Call will appear.Step 3: Click on Emergency Call and, while it's switching, swipe with your three fingers down.Step 4: The Notification Center will appear!Step 5: Click on the Weather widget and wait for the weather app to load.Step 6: Click on the home button to exit to the iPhone's springboard.
There you go! Your iPhone is now running iOS 5.
Sources : Upgrade to iOS 5 - iPhone 4, 3GS, iPod touch 4G, 3G, iPad 1, 2 - Without a Developer Account!