StumbleUpon Down or Updating

StumbleUpon Down or Updating: StumbleUpon, one of my favorite web surfing & navigation networks, seems to be experiencing downtime this morning.

I’m not able to surf, submit or suggest using the StumbleUpon toolbar or its web site.

Is anyone else experiencing this problem?

Sometimes in the online world, downtime can equal major update (thinking YouTube or search engines). I wonder if StumbleUpon, in the highest populairty peak they have gained thus far, is upgrading.

Your thoughts? What would you like to see StumbleUpon add?