Digg will unleash its new advertising platform which allows users to vote. Depending on the type of vote, the advertiser may spend more money or less money. Would you consider advertising on Digg? Is this system a turnon or turn off?

Can you tell me what is Digg...
I am new to this forum, and I want to know what Digg can do ...

No, rather one should try to get on front-page of Digg.

Digg is a community sharing news site where high rated news appear on the front page.

No big deal , stumbleupon already has such service.

Also the front page ads space might be too expensive and I am not also sure whether that will be effective?

true, and the un-targeted traffic is always my biggest conern.

how about after submitting digg then i submit the url to google/addurl, does it have any effect at all?

Google already cache it through digg page so I don't think it worth to submit it in google. If it is getting good number of voting you can share the link to different social media site such as twitter/facebook..

I think that working with Diggs ad system may be a good idea. Digg is the 122nd top site on the internet according to http://www.alexa.com
advertizing on a popular website is usually good for business. I only see one con in the alexa information. Most users stay on the site for four minutes per day.