Just a few quick thoughts on the announcement that Microsoft is acquiring Danger, maker of the Sidekick series of smartphones: (1) As Backstage readers may recall, I was an avid Sidekick user during the Sidekick II and Sidekick 3 days. With very few reservations, I loved the Sidekicks. Their keyboards were great. Their instant messaging, web browsing, and phone features were great. And they were fun to use. (2) I struggled with whether to stop using?