BigBoss has announced a major update to his Semitetheredsolution for 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 yournotification 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.
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.
You can find instructions on how to perform the Semitethered jailbreak of your iOS device here.