‘It’s the Latency, Stupid!’, a fantastic article explaining why latency is sometimes more important than simple bandwidth.
This was found via Karl Jeacle’s comments on eircom’s DSL, which are very illuminating in themselves — although probably not too interesting for non-Irish folks ;). But the relevant part is the explanation of why they enabled interleaving on eircom’s DSL network (summary: to get more reach, as far as I can see).