It would seem no. It's merely keeping the widgets updated and not sending anything particularly personal to home.
But in the interests of documenting code snippets for my own failing memory here's how to unload the dashboardadvisory service:
I found two references, not sure which should (maybe) be scrubbed)
sudo launchctl unload -w \
/System/Library/LaunchDaemons/com.apple.dashboard.advisory.fetch.plist
sudo launchctl unload -w com.apple.dashboard.advisory.fetch
found these references on Digg
locationd: similar scenario only now we're talking about the clock keeping itself updated and it can *try* to assess your location in order to do that.
Found some discussion at Superuser
Again, it would seem not to be a big [privacy] issue.
