I am trying to get ridge on the problem with lvm2. Therefore I have to get some old packages from snapshot.debian.net. Unfortunately it seemsto be broken for some time now.
While the syntax you use doesn't seem to work anymore and /archive appears empty it seems you can still browse directly to a year. e.g. for 2009 http://snapshot.debian.net/archive/2009/ (the trailing / matters) interestingly it appears the requests are being proxied to hikaru.fsij.org................