reply to tschmidt
Re: Keeping pace There's also the effect this has on P2P networks. If an increased dl limit is accompanied by a subsequent increase in the upload limit, then those who have that higher limit could provide faster uploads through bit torrent and the like. So once more can provide it, that'll push the BT downloads a bit more. Until more can upload faster however, they won't be feeding it.
At least where p2p networks are involved, increasing BW on a residential lines can help the p2p d/l go faster (by providing faster uploads from other peers).