If you are using the netbook remix edition of the Ubuntu 10.10 Maverick Meerkat, then by default you can see the Files & Folders icon in the dock bar, which will display the files inside your home directory only. So if you need to mount other partitions, you can use bash if you are a power user. But if you want our good old simple file browser, then what you need to do is:

1. Open the Trash.

2. Trash is opened in the file browser.

3. Now the File Browser icon appears in the dock.

4. Right-click the File Browser icon and choose Keep in Launcher.