I guess everyone it jumping on board, now! Yahoo has launched a Yahoo! Mail and Yahoo! Messenger app for the Android Market, in a press release this morning.  Yahoo! also launched HTML5 mobile websites for the iPhone and a Yahoo! Search Widget for Android.  The new Android app features include push notifications for new e-mails, Yahoo! Address Book integration, e-mail search, photo uploads as attachments from the camera, emoticons and rich text formatting.  There is also easy toggling between Mail and Messenger.