Looks like Dell's stepped onto its own toes real hard with the Streak's Android 2.1 update -- O2 just confirmed to us that due to some "feedback from users, " it's decided to suspend said download while Dell gets cranking on a revised software release over the next two or three weeks.
ENGADGET: Dell Streak's pre-rooted Android 2.1 update quietly suspended, revision coming in two or three weeks