Moments ago Redsn0w 0.9.8b1 Version was released for Windows users to Jailbreak iOS 5b1 Tethered. Now ih8sn0w the Dev Behind Sn0wbreeze also pushed an update to its tool to jailbreak iOS 5b1 on Windows. Sn0wbreeze got updated to 2.8b1.

sn0wbreeze v2.8 BETA 1 Release Notes:
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* Supports iOS 5.0 BETA 1 (9A5220p)
* Supports the following Devices:

- iPhone 3GS
- iPhone 4 [GSM]
- iPhone 4 [CDMA]
- iPod Touch 3G
- iPod Touch 4
- iPad 1G
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* Props to @MuscleNerd for the kernel patches. :)
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* THIS IS INTENDED FOR DEVELOPERS ONLY!!!
* This sn0wbreeze does NOT add afc2 or Hacktivate to prevent users
 from removing the UDID check after jailbreak.
* UNLOCKERS SHOULD STAY AWAY!!!
* This is a /TETHERED/ jailbreak via iBooty.

If you are planing to use this to by pass the activation screen so forget about it. This is only for Developers. If you are on of the Developers and want to Jailbreak your iDevice so Follow the guide present Below.

Steps to Follow:

Step 1:

 

After downloading all of these files, simply head to our recently covered tutorial of jailbreaking iOS with Sn0wbreeze here