Well, I have been a big fan of "logmein" for quite sometime now. And I also use glance at office quite often.
Many times (while in Sweden), I have felt as if I saved the world, when I remotely got into my machine at home (in Sri Lanka) using logmein, and showed my wife how to download something
.... LOL.
So It would be quite interesting to see Tahiti also made possible to be accessed over HTTP, using a simple browser window (probably with ActiveX for now ..... and maybe why not .... even Silverlight
someday), without having to make the other end install Tahiti, which some people may not feel comfortable about.
And most definitely (as Marco also pointed out..) the invitee should to be able to set the required resolution, cos when I tried sharing 1024 x 1280 Visual Studio screen, the other person who was on 1024 x 768 had to use a magnifying glass.
Anyway keep up the great work. I'm excited that the Microsoft family also has a screen/desktop sharing utility now.