Dell has been on a roll lately with updating its line of Streak smartphones and tablets. Both the Streak 7 and the Streak 10 Pro have been upgraded to Honeycomb or updated to a newer version of Honeycomb, respectively, and now Dell has put up updates to Stage UI, the Dell-branded Android skin, and its widgets.
Almost every Dell widget has been updated here; the only two that are still stuck on their previous versions are the Music widget (which isn't available at all) and the Dell Widget Updater. There's also a new Contacts app for the Streak 7, but it doesn't work right now.
Also odd is the fact that there's another set of Stage UI widgets labeled under Stage UI 2.0, which was destined for the Streak 10 Pro. Although they're in the Marketplace, I'd advise you not to try to install them: they won't work.
If you want the updates that do work, you'll have to swing on over to the Marketplace to get them. The Widget Updater on your Streak devices won't show any updates.