i certainly am.It did happen once before too and that times i got speeds of 300KBps (2.4 Mbps). the situation was like this for 5 hrs but unfortunately that day my comp was destined for a format so i couldn't utilise the speeds.
that was like 8 months ago.as for the last night situation, i was able to download a 400 meg file within 45 hrs from the torrent network. it was good while it lasted but speeds are now back to normal when i tried again this morning.
Speed Blasts like the one u got happen with all lan ISP's I used to get 4-5 Mbps sometimes on both Hotwire and sify. Speed could have gone higher but i think that was the maximum that the cheap quality 2 pair cat 5 cable and hubs could support.