A few hours ago GeoHot released his Windows 3.1.* jailbreak for all devices. Go here to get it. So far results appear to be generally positive and most are reporting an easy jailbreak with few problems, though some iPod touch 3G users are held to a tethered jailbreak for the time being and issues are being reported with the new updated 8GB device.
iPtF member smoothfreeze has a small blackra1n tutorial up here.
As usual iPhone 3G and 3GS users should be aware that blackra1n DOES NOT UNLOCK and you should not upgrade to 3.1.* firmwares as the 05.11.07 baseband has not been hacked. If you need an unlock you should stay on 3.0.* firmwares as the 04.26.08 can be unlocked with ultrasn0w, though you may create and install a custom 3.1.* ipsw (with the 04.26.08 baseband hacked in) with the Dev Team’s PwnageTool v3.1.3 for Mac.
Other news? As everyone with any sense had already worked out, the ‘other’ jailbreak that was scheduled to drop this weekend was a total fa1|ure and a fake. blackra1n is the ONLY 3.1.* jailbreak currently available.