Is it because Digg is the most famous?
Is it because it sends better targeted traffic?
No and no.
It's the size that matters. Let me explain that in plain English.
Hey Mike, perfect timing for this post! We just finished up doing some serious optimization of the 'Plug This' widget. We knocked it down from 97.5 KB to 4.4 KB. Sure it's still 4 times as large as Digg's button, but at least it won't cost you a visitor! Digg's button sends your visitor to Digg, but if they vote for you on the PlugIM button, it updates right on your site using AJAX so you don't lose your visitor. That's quite a deal, don't you think? ;-)
PlugIM is a user driven internet marketing community. Submit content, share articles, comment on projects and promote your favorites to the front page. If its internet marketing related, plug it on PlugIM.
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Btw, how can I customize the script? I need to change the bakground color so that it can integrate better with my design.