We all want our systems to be quick and responsive and with every new distribution comes new applications and new tools. So, with the new Ubuntu version, 8.04, a new set of tweaks are necessary to speed it up.
Here's a list of tips from Softpedia.com. I particularly find the "System Tweaks" to be particularly useful.
Why don't you try 'em out and see for yourself? Will do this on a spare Linux box later.