This sounds like an ideal task for svk (http://svk.elixus.org/). It is a decentralized version control system based on Subversion.
It allows you to mirror Subversion repositories (certain branches or the whole repository) and work offline while allowing check-ins. When you go online again you can synchronize your subversion mirror again with the remote repository.
Additionally it makes the merging of branches much easier because it tracks changes, which have already been merged and you don't have to remember the exact revisions yourself.
There is also a book in the works which looks very similar to the subversion book: http://svkbook.elixus.org/
But I can't tell you, how it's doing in production ... Cheers, Andreas Arje Cahn wrote:
Hi all, Last year at the hackaton I found myself waiting for hours for my Eclipse to checkout the latest Cocoon code until I could actually do something. Does anyone know of an option of doing this in advance before the hackaton and have some kind of a mirror/proxy on location? Arje
