Double toast/bump
Haven't rooted it yet, but is there still a chance of bricking it after it's all rooted and done?
Rooting isn't dangerous at all, the only way you can end up bricking it is if you somehow stop ClockworkMod from flashing CyanogenMod to your device, and even then, you'll just have to use HTC's ROM update utility to get back onto the stock ROM and do it again.
What redsn0w do I download for 4.2.1 2g mc Ipod touch?
I'm guessing the latest one, 0.9.6rc18.