Vyew.Free desktop sharing and collaboration via your browser. It uses Java and works quite well as far as I can tell, although I haven’t pushed it in a real heavyweight test yet. Worth a look anyway.
Vyew is a FREE web conferencing and collaboration platform that enables shared visual communication from any browser. Vyew provides a real-time workspace through which web users can share ideas and work together. Vyew users can collaboratively create Microsoft PowerPoint-like pages by intermixing Microsoft Office and Adobe PDF files, images, white-board annotations, and more. Desktop sharing, screen capturing, text-chat and teleconferencing are built-in.