If you have noticed a drastic slowdown in your DSL internet connection after you upgraded to Ubuntu Hardy Heron (Ubuntu 8.04) then it might not be that your ISP is entirely to blame. It could be settings on your PC that is slowing things down. We had a problem in our office where Ubuntu PCs were getting only around 80Kbps as opposed to 2Mbps from Windows machines. After troubleshooting and playing with some configuration parameters we got the Ubuntu Machines up to the same level as the Windows PCs