Archaeological background to the clades variana battlefield can be found at the Museum und Park Kalkriese, Osnabrűcker Land, Germany.
I myself had a flying visit there in 2003, with rather meager photo results. Meanwhile, the 2000th anniversary of the battle is here: What happens in 2009?
Adrian Murdoch, author of Rome's Greatest Defeat: Massacre in the Teutoburg Forest, has been blogging updates connected to the event, but unfortunately most of the newpaper clippings and interviews are in German. I have saved the most interesting articles to my computer and may refer to/summarize them, blogging time permitting.
In his latest, he points to Focus Magazin: "Lots too at Focus which is developing its series 2000 Jahre Varusschlacht. It is worth keeping an eye on, as new articles appear to be going up on a daily basis at the moment."
You can also follow Adrian on Twitter.