We've been using the Marketo-WebEx connector for well over a year and have been happy with the results.
However, it appears that WebEx has made some changes that make the registration process unduly burdensome for the attendee. (This was pointed out to us by our CTO.)
I don't know if any functionality has advanced on the Marketo side so I am looking for any tips in general.
Specifically, I am also looking for anyone who has a solution that allows us to populate each Attendee's WebEx generated unique log-in URL into a Marketo confirmation mailer.