So you have multiple screens under Xfce and want to have one task bar on each screen, only showing applications on that screen. Here you go:

Create one panel for each monitor. Panels can be created from the panel preferences of another panel (yeah...).
Unlock each panel by going to Right click / Panel / Panel preferences... and uncheck "Lock panel". You now see a grip that you can use to drag one panel to the bottom of each monitor.
Again go into the panel preferences, and under Items add a single item "Window buttons". In the item preferences uncheck "Show windows from all monitors". Also uncheck "Show flat buttons" for awesomeness.
Switch back to the panel's "Display" tab, check "Lock panel", uncheck "Automatically increase the length" and set the length to 100%.

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Xfce: Separate task bars for each monitor