I always thought that it would be nice to dial a number and record a transcript of the meeting.

Also, there are only so many kinds of meetings so have templates for agendas could be useful. Status meetings, company/departmental meetings, company notification meetings(manager tells employees about talking points and answers questions), come to a decision meetings, kick off meetings, etc.

Also, some meetings could be done through other means. document with a quiz(I'd rather read talking points then meet about them). Q/A documents.