Looking for Frequent Teleconference Hosts

As I mentioned before, I am in midst of launching a webapp under Appily label. Underlying theme of Appily is a growing collection of simple yet practical webapps. While the first app is being preped for trial launch, I wanted to start thinking about the follow up which is intended to address common teleconferencing needs. One problem I have is that I am a frequent teleconferencing user but never hosted one involving more than a handful of people.
So I would like to have in-depth discussion with folks who frequently hosts medium to large teleconferences (i.e. financial teleconferences). If you are such a person and you are interested in helping me identify common problems, please contact me.

UPDATE: If you would rather just coredump teleconferencing problems and wants, please use the comments. Note that I am not looking to replace any existing teleconferencing systems (it'll be awhile before telephones go out of style), just augment them to improve their effectiveness.