TinyUmbrella has been updated to new version 5.11.0 to save the SHSH blobs for iOS 5.1.1, it is very important now to save your SHSH blobs since there are news that new 5.1.1 untethered jailbreak will be released very soon. Below are the direct download links for downloading the latest version of Tinyumbrella released by NotCom.
Why to save SHSH blobs? Some times due to an unexpected error in jailbreaking or unlocking you may need to downgrade your firmware to previous versions. Therefore you need to save SHSH blobs on Cydia for future downgrading. TinyUmbrella is used for saving the SHSH blobs of your iDevices from Apple server to Cydia. If you plan to downgrade your firmware in future due to any reason you must save your SHSH blobs before upgrading to the next iOS versions.