Today I registered and tried out LotusLive: apps.lotuslive.com.
LotusLive is a web browser based global conference tool, which works very similar to a SameTime conference.

The benefit over SameTime is that you don't have to install any software (only browser plugins, and a bunch of SSL certificates), and that the meeting is available on the internet, globally.

The people who are invited to a meeting (anyone can be invited who has internet access) can use Firefox or IE, but the host needs both browsers to create a meeting.
The meeting must be created with IE8 (since sharing apps doesn't work in Firefox, it just hangs), and then the invitation must be sent with Firefox using a different LotusLive account, since the sending of an invitation doesn't work in IE8.
Alternatively, Firefox can be skipped, if the invitation is sent via normal mail (there's a link for that on the main page of the meeting hosting).
You can also use SMS or instant messaging to send the link directly to your invitees using a URL pattern like this: https://apps.lotuslive.com/meetings/join?id=123-456, where the 123-456 is the meeting ID.

I tested to share single application, and also to give control to a colleague, and it worked fine.
It was a bit slow, using Notepad++ as shared application, or a OpenGL 3D engine application, but it worked.
LotusLive meetings have also a live video stream, which I didn't try yet, but I think they could be used to give better realtime application performance, and also live audio and video.

If the bandwidth could be improved, it could really replace coorporate SameTime conferences, and adding the feature that also external vendors and customers can be invited to the meeting. This could potentially eliminate a lot of travelling costs around the whole world.

I read in the news that Obama is putting 825 billion dollar to raise the bandwidth in USA, so this will be positive for LotusLive also, as well as for creating 2.5 million new jobs and getting the broadband to schoolkids and hospitals.