If you like the concept behind Digg and Reddit, but hate sifting through dumb time-wasting garbage to find something educational, informational, or useful, then you may want to take a look at DailyHub. Founded by Dharmesh Shah of OnStartups, DailyHub is intended to be "social content for business geeks." A manifesto on the site explains how it is different from other social news sites, and what you can expect when you use DailyHub.
One of the best functions of Dailyhub, is the ability to create your own sub-hub targeted towards a niche or category that interests you. I haven't used that functionality yet, but it's definitely a cool idea. Another features allows you to create a group and save links to that group. So, for instance, if you wanted to create a group for your company and share articles that others at your company may find interesting, DailyHub make that easy.
If you are looking for a new source of good information, and a higher signal to noise ratio, check out the site and post something of your own. Most importantly, vote for the best stuff and help keep the front page useful and free from cheesy YouTube videos.