It’s always a good idea to have accounts on more than one conference service. If you are on one, and their system goes down, you can send emails to people with another number/service to switch to. Some of the free conference services are less reliable than other since as they get more popular there is more challenge with capacity.
We use FreeconferenceUSA to record telephone sessions. It’s easy to use, has been consistent, the recording is good quality. You sign up and have a line that is available anytime, you don’t have to set anything up, just call in.
Free, cross platform, simple to use, records up to 5 minutes, no editing, also does screen shots with simple drawing tools to point things out. Free version only makes flash movies (won’t play on ipad), paid version also creates .mp4
commercial software, cross platform (Intel only on Mac,) relatively easy to use, robust editing tools, creates movies in many formats for a variety of device, more extensive features on PC, but also a lot more expensive.
Mac only, focused on screen and video capture
Allows you to share images, drawing, ideas etc.
Shared whiteboard with the ability to have people create sticky notes and do affinity grouping.