This link has a lot of example pages of what JavaScript can do!!!
http://www.sencha.com/blog/2010/08/18/blackberry-torch-the-html5-developer-scorecard/
http://www.sencha.com/forum/showthread.php?91645-Cherry-On-Ext-3.0.0
http://www.sencha.com/forum/showthread.php?94577-Software-keyboard
http://www.sencha.com/forum/showthread.php?105550-Porting-Aristo-to-Ext-JS
http://www.sencha.com/forum/showthread.php?76185-GridFilters-enhanced-filtering-for-grids
http://www.sencha.com/forum/showthread.php?103343-Azenis-Theme-for-Ext-JS-3.2
http://www.sencha.com/forum/showthread.php?82377-Ext-Scheduler-Scheduling-Planning-Gantt-component
http://www.ext-scheduler.com/examples.html
http://www.sencha.com/forum/showthread.php?106613-solved-Simple-Tasks-(without-Gears-or-AIR)
http://www.sencha.com/forum/showthread.php?26585-Web-Based-EMail-Client-written-with-Ext
http://www.alistapart.com/articles/svg-with-a-little-help-from-raphael/