MuscleNerd posted some information on the semi-tethered JB here.
Just want to share the info with you guy.

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i have read over the teathered jailbreak and the semi-tethered jailbreak, what is the difference?

I think semi is not quite everything included in the tethered one, but I'm not entirely sure. Hope it helps a bit.

Tethered requires a hard computer connection (i.e. cable) to reboot Touch. Semi-tethered will reboot to "non-hacked" OS (i.e. standard functionality) without computer, but to "jailbreak" OS when tethered.

From what I understand, rebooting the semi-tethered without a computer will lose jailbreak functionality for that boot, but when you reboot again while tethered, you will regain your previous jailbreak state. In other words, you won't actually lose any of your installed programs, just the ability to use/see them when you perform a non-tethered boot. But I'm not 100% about this. Regardless, I'll just wait for the untethered hack.

Better off doing the untethered jailbreak now..