Well for those of you that are not following the switch to Yahoo! as the proposed default search provider for Ubuntu's Branded Firefox by default, the decision has been made to revert that change back to the familiar Google Search Provider for the 10.04 release ( and the next Beta CD Images)
Each release we determine the best default web browser and the best default search engine for Ubuntu. When choosing the best default search provider, we consider factors such as user experience, user preferences,and costs and benefits for Ubuntu and the browsers and other projects that make up Ubuntu. Up until Ubuntu 9.10 these defaults have always been Firefox and Google. Earlier in the 10.04 cycle I announced that we would be changing the default search provider to Yahoo!, and we implemented that change for several milestones.
However, for the final release, we will use Google as the default provider. I have asked the Ubuntu Desktop team to change the default back to Google as soon as reasonably possible, but certainly by final freeze on April 15th.
It was not our intention to "flap" between providers, but the underlying circumstances can change unpredictably. In this case, choosing Google will be familiar to everybody upgrading from 9.10 to 10.04 and the change will only be visible to those who have been part of the development cycle for 10.04.