Just downloaded the new Skype which introduced desktop sharing. I can now cut out Webex for internal meetings and discussions and have conference calls on skype.
I use WebEx heavily for internal meetings, trainings and other types of virtual gatherings.
Desktop sharing isn't required in all virtual gatherings, but is a necessary about 60% of the time. If it is built in and easy to do I will do more often.
Now skype is positioning itself against Webex, GoToMeeti...