I am using Dell Inspiron 1545 with Ubuntu for 2 years and Develops web Application. Dell Must included software packages for Web Developers. Following are some tools that are must in Dell's Laptop. :
1. XAMPP (it makes laptop a choice for PHP developers)
2. FileZilla Client.
3. Firefox(with web Developers Tools and FireBug) ( Custom Build )
4. Eclipse( for Android and PHP Developement)
5. Web Developer Tools for Ubuntu ( https://launchpad.net/~petrakis/+archive/wdt-main )
6. Qt Creator( for Android and Cross-Platform Application Development )
and If you include some extra softwares like :
6. VLC Player.
They are bounus to user.