Combining documents in Snow Leopard's Preview

For all those who are constantly looking for PDF tools, I just noticed this tip on Mac OS X Hints from this Tuesday:

It basically explains new features available in Preview that make it easier to combine images or PDFs.

A hint on Monday described how you can split some pages out of a PDF file by selecting them and dragging them to the Desktop in 10.6. See:

thanks for the links! The command Data > Merge is also able to combine images & PDF documents. And copying selected pages and using Data > New > From Clipboard afterwards is similar to the second hint.