Kinda, but really the logo at the top left of a page (generally) is the branding of a site. Plus to an unsuspecting user, it seems like the site is endorsing Digg.
At first I didn't mind the digg bar, but since working on a project which sometimes comes across digg bar links...quite simply I !#?*ing hate it. They've broken how the web works, now I need to specially parse the page to find the real link. The least they could do is change it so it only shows the Digg bar to user-agents that are from a well known browser, else just redirect to the real URL.
What they really should have done is check whether the user is an existing logged in Digg user, and only displayed the bar to those users. The bar is utterly irrelevant and intrusive for every other Internet user (this is without going into the ethics of what they're doing--just the interface/design decision they made).
