I installed Debtorrent on my Hardy install last night and it was pretty painless. The standard sudo apt-get install debtorrent, then edit the apt source.list file and prefix every line with localhost:9988/ and away you go.
This morning I tried an apt-get update && upgrade, and what a marked improvement on the download speed. Update took a little longer, but I got about a 3x improvement on downloads. The one downside is there is no indication of progress, so it looks like it just hangs, then is magically finished, so just have faith.