iClarified - Apple News - Semitethered Jailbreak for iOS 5 Gets a Major Update
"BigBoss has announced a major update to his Semitethered jailbreak solution for iOS 5.
v0.9.1 incorporates Saurik's new mobile substrate. Thanks to Saurik, we are entirely rid of all the daemon patching – this means there's no more daemon patching or restarting. Most the semi-tether work is now done by mobile substrate. The semitether package from the repository now protects your iOS 5 notification center plugins and gives you the option to patch mobile safari so that it will work on the non-jailbreak reboot mode. I'm still looking into patching mail, if possible.
Changes:
1) Much more stable with new mobile substrate
2) Can patch safari so it works in the non-jailbreak reboot mode
3) App to monitor the status of your semitether and reapply. Check after cydia installs.
Please note this is still a beta and requires a beta version of MobileSubstrate. An update from MyWi and Appsync should bring compatibility with those as well." News - Hackulous