Kevin Devin asked how SharedView fits with Netmeeting and Livemeeting – my first thought when I was using this product was that it appeared to provide similar functionality to netmeeting. This product is actually the Tahiti product that Microsoft purchased, rebranded and re-released as a new beta product.
I’ve not used netmeeting for several years so the statements may not be entirely accurate.
However the differences I see are as follows

1. Looks a lot nicer than the netmeeting did.
2. You can share your desktop with up to 15 people – netmeeting was limited to 1.
3. Works much better through firewalls – I’m guessing it is http based so no firewall tweaking needed.
4. No directory support included – netmeeting had the ability to join a directory of available chats – this needs an email address to connect to the original host (but there must be a directory on MS’s servers somewhere but it is just not viewable to the public)

I didn’t find the performance to be that great, with my two pc’s connected the screen refresh was pretty slow and artifacts would often be left behind on the screen. I did like the fact that you could see the guests cursors (but this would be pretty hectic with 15 guests) but you can turn this feature off.
If another program was moved over the top of the shared application, a grey box would appear on the guest screen where the application was – this almost looks like screen corruption but it isn’t.
The host computer will only share one monitor, spreading the shared application over 2 screens will only share the portion of the application on the hosted screen
It takes a small part of the desktop as the controls get placed at the very top of the screen – a nice feature would be to merge this into the title bar of the application to recover a little more screen estate.
File sharing worked nicely and I was easily able to share files between the two computers. It would be nice to have the downloaded file appear in a most recently downloaded window or have the option to open the file once it was downloaded in the same manner ie/firefox does.
I’ll be adding my feature notes to the Sharedview forums shortly.