Chrome: If you like some of Chrome's new webapps but don't want to change your tab page, extension App Launcher will let you launch apps from the address bar.
Why open a new tab and click on a shortcut when you could just open it straight from your current window? The Chrome App Launcher extension puts a little icon in your extension bar, from which you can launch any of your installed Chrome apps. You can even navigate through the menu with your arrow keys (sadly, there's no hotkey to open the drawer, though). What's especially nice is that now you don't have to sacrifice your custom start page just to access the awesome new TweetDeck or New York Times app. Hit the link to check it out.
Chrome App Launcher is a free download for Google Chrome.