Here is a download links for iPhone OS 3.1.2. I know that this is not the latest firmware but I think  everyone should have this files.

• 3.1.2: iPhone1,1_3.1.2_7D11_Restore.ipsw(2G)
• 3.1.2: iPhone1,2_3.1.2_7D11_Restore.ipsw(3G)
• 3.1.2: iPhone2,1_3.1.2_7D11_Restore.ipsw(3GS)

You can find full list of iPhone firmware (1 to 3) here.

Few hours ago Dev-Team released their new PwnageTool that can jailbreak iPhone OS 3.1.3. Unfortunately this version can’t jailbreak iPodTouch 3G nor iPhone 3GS!

iPhone 3GS users still be aware to update to this new version of OS (3.1.3), if you update accidentally like me you have to wait until the next releases of Dev-Team tools.

You can find the whole article here at Dev-team Blog.

Official Releases

• PwnageTool 3.15 Torrent  - PwnageTool_3.1.5.dmg.5344262.TPB.torrent
• SHA1 Sum = 16611fb60d088edd2fa5128e4f95f35d8e56a603

Unofficial Mirrors

• http://www.hackthatphone.net/PwnageTool_3.1.5.dmg
• http://www.ipodtouchmasterfr.com/files/PwnageTool_3.1.5.dmg
• http://apfelportal.de/host/images/PwnageTool_3.1.5.dmg
• http://zombisoft.com/tools/PwnageTool_3.1.5.dmg
• http://www.accesoriigsm.net/PwnageTool_3.1.5.dmg
• http://files.bestblog.de/iphone/PwnageTool_3.1.5.dmg