I just wanted to post a quick note to the 'cross folks. I have an '06 Poprad w/cantis and the alu fork. I have been dealing with the extreme fork chatter that can sometimes actually brake the front wheel loose; apparently this is a common issue with these bikes, as another local fella (who is a 'cross racer, I am not) was complaining about the same thing.
After trying pad angle adjustments, and passing on switching pad compounds, both recommended fixes from LeMond, my shop told me to email LeMond customer service. I did so, merely asking if this was an inevitable consequence of a design decision, or something that could be prevented with some tweaking. I received an almost immediate reply that the customer service rep wanted to talk to my shop.
They sent some carbon replacement forks to my shop, and now myself (and the other local 'cross racer) are running on carbon forks.
I haven't ridden the Poprad a ton lately, preferring my fixed gear bike, but in the few rides since the fork replacement I can say the chattering seems to be reduced nicely. The bike feels much better now. Still a little chatter when hard on the F brake at low speeds, but I've always felt this on canti bikes. Nothing that feels like it will force a spill.
So if you have a Poprad with the alu fork and cantis, you may be able to get switched out to the carbon version for free. I thought this might be of interest to some folks, hope it helps someone out there.