Unnecessary files that can be deleted/moved in cluster dir?

I have a little problem, I let my drive get too full. And then while I was deleting rows to free space, the auto vacuum didn't kick in quite the way I expected, and I ran out of space entirely. So the DB shut down and won't start back up.

So is there anything ( other than the logs in pg_log) that I can delete, or move temporarily, to save some space and allow the database to start up and finish it's vacuum?

Or is there a way to move some of the stuff to another drive? The whole cluster is too big to move entirely to a new physical drive (the machine is in another city so I can't just plug in a USB drive or anything, but I can put stuff on network shares for now) and there is nothing else on the partition other than the cluster.

Thanks,

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John Abraham