New logo wanted for Speaker Tree

Speaker Tree

This logo will be for website that allows speakers and presenters to post their details within a directory and allows users to search that directory of speakers (such as keynote speakers, categories, topics, etc...). The target audience will be both speakers and those looking for speakers to come to speak at their organization or audience on a specific topic.

We have had a few ideas regarding the logo. One idea is that the trunk of a "Tree" represents a person with arms as branches and leaves that represent ideas. Other thoughts are that the "trunk" of a tree could represent an actual microphone (with the roots being the cable of the microphone) and the actual head of the microphone represent the top of a tree. Other thoughts are that tree of knowledge that is spreading seeds of wisdom from each speaker (however that is represented :)). Overall we are open to any ideas or concepts that designers might have.