[Schimmi]

Save the following as AppleScript in "Library/PDF Services". It will show up in the print dialog in the PDF popup:

on open these_items
	
	try
		set f to the item 1 of these_items
		
		tell application "PagePacker"
			set page size to A4
			make new document
			tell document 1
				set file source of page 1 to f
			end tell
			tell application "System Events"
				tell process "PagePacker"
					activate
					set frontmost to true
					keystroke "p" using command down
				end tell
			end tell
		end tell
		
	on error error_message number error_number
		if the error_number is not -128 then
			tell application (path to frontmost application as string)
				display dialog error_message buttons {"OK"} default button 1
			end tell
		end if
	end try
	
end open

Stefan