Ever since Xobni launched at the first TechCrunch 40, it's been about Outlook and then Blackberry . But those of us who use Gmail also want to make our inboxes smarter. Today, Xobni is launching aprivate beta for Gmail, and will soon also launch iPhone and Android apps. The first 100 readers to sign up for the Gmail beta will get in (use the code XOBNI-TC100). The Gmail app comes in the form of a browser extension for either Chrome or Firefox (Safari and IE will come later). Once you install it, a Xobni sidebar appears in your Gmail Inbox. Once you allow it to index your contacts and hook it up to your Twitter, Facebook, and LinkedIn accounts, it starts to show you all sorts of relationship data. Contact search in the Xobni box is hella fast, much faster than searching in the Gmail search box (but only for contacts, it does not index the entire text of your messages).