LibreOffice 4.1 allows the fonts used by Writer, Impress and so on to be embedded into the document. This removes the largest impediment to using the large number of excellent free fonts which have appeared in the past few years. The result is documents that look much, much better.
The user interface hides this in the per-document configuration: File | Properties | Font | Embed fonts in the document.
PDF remains the best format for exchanging completed documents, simply because PDF readers are available on almost every device.
On the downside, outputting files into the ePub format still uses a difficult plugin. It would be very nice if Writer handled ePub as a first class document format such as .DOC or .DOCX.