Many of us are awaiting that link. Be patient, the jailbreak is bound to be out soon. Keep checking back on the forum, it will announce it when it happens, whether it's on the homepage or the Jailbreak forum
obviously it does not have the iphone 4 yet but once you know how to jailbreak any other firmware and device its pretty much same for all iphones... just they change name of tools apart from pwnage tool thats stayed the same though its for mac only pwnage tool.. any way have a look you might like it.. i found it very helpfull when i was first starting to jailbreak
it will be released on Sunday accounding to this news blog
"Comex today has posted on his twitter account the estimated release date of the new spirit jailbreak for iPhone 4/3GS (New boot), he mentioned that he will publish the new spirit jailbreak tool at the next Sunday if it completed (It is in final phase), this will fire the competition with the new Limera1n jailbreak. "
I'm not in any huge hurry to jailbreak. The two main reasons I jailbroke my 3G back in the day was so I could use skype over 3G and so I could tether to my laptop, which couldn't be done before, but can now with skype in its current configuration and with the HandyLight app.
Oh, but the free cracked apps from hackulous were nice too... I miss that.
Jailbreak isnt out. This is the first ive heard about the supposed comex release date. Sunday would be great but thats wishful thinking. Also, you can upgrade if you want to ONLY if you back up your shsh blobs via tinyumbrella. That way if the newly released jailbreak requires 4.0, then you can always downgrade. But myself and most people will wait with 4.0. Nothing special with 4.0.1