We have made it our rule to not evaluate enterprise online meeting tools but we would nevertheless like to make you aware of RHUB, which we find to be an interesting web conferencing solution.
TurboMeeting exists in various versions. In the smallest version two web conferences can take place in parallel with a total of 10 participants. On the upside, TurboMeeting supports a broad range of platforms, e.g. Windows, Mac OS X, Linux, Solaris/Unix, iPhone. On the downside, neither VoIP nor a telephone conferencing service is integrated.
As an enterprise solution RHUB is definitely interesting. Yet, with our focus on SMBs we will not evalutate the tool in detail.