Start PCManFM (file manager).
PCManFM sidebar by default (on the left) shows shortcuts in order top to bottom: Home Folder, Desktop, Trash, Applications.
11.10: Side pane needs to be set to Places. View > Side Pane > Places.
11.04: Side pane only shows Places.
Trash is also accessible from Go > Trash Can.
For sidebar, right click on Trash to empty.
Note: This is true for Lubuntu, as I am using it at the moment. I expect it would be the same in LXDE installed within Ubuntu, but perhaps it's not for some reason.
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