I worked a lot with phonegap and jQuery Mobile lately. I got the new Dreamweaver CS6 and started to create some prototypes. I could have used Notepad++ or an IDE like Netbeans but i wanted to try Dreamweaver because it has some features that make developing a mobile app really pleasant.
The jQuery Swatches Window makes it easy to select a jQuery Mobile form element or for example a button and paste it into your app. The live preview is a also nice feature. The best feature for me is the integration of the phonegap builder. You create your app, click on build and then you can scan a QRCode for Android, iOs, ... and you get the app on your phone and can test it there without any effort on your side.