One of the difficulties with creating a great presentation for church use (with OpenOffice.org Impress or Microsoft PowerPoint) is finding images that are legal to be used.  Most people to whom i talk about this are not aware that they are not legally entitled to use many (most?) images returned in search results without explicit written permission.

Many people may not realise it, but Microsoft Office is not a standard format, and there are many compatibility issues and security risks associated with sharing documents in those formats.