Ealier today, GeoHot tweeted that he will release a new version of BlackRa1n.
coming tomorrow, #blackra1n RC2!!! fixed 3G support, tethered ipt2 MC and new 3GS support; icy is already fixed
I will let you know once BlackRa1n 2 becomes available for download. In the meanwhile, you can still refer to our BlackRa1n tutorial.