Hey MDK,
You will be able to Digg articles properly in OmniWeb 5.5 which isn't officially released yet but you can try a preview release by registering on these forums and then once logged in access this thread:
http://forums.omnigroup.com/showthread.php?t=527
The catch is that there's a known issue with with digg right now that will cause OmniWeb to hang for a minute or two when first loading the page, so there are still kinks to be worked out....