Merge files in Finder

With iCombiner you can merge PDF files, TIFF files, scanned documents, images and photos directly in Finder via the contextual menu.
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To use this feature, first download iCombiner. Then install the Finder plugin:
  1. Choose iCombiner > Preferences and click Install
  2. When asked if you want to restart Finder, click "Yes, restart now"
  3. Wait a few seconds for Finder to restart

You can now merge files in Finder by selecting the files you want to combine, Ctrl-Clicking on one of the selected files and clicking More > Merge to PDF...
ContextualMenu

Requires Mac OS X 10.4 Tiger or later. Snow Leopard ready.