Visio online for free: GLIFFY

During some research for a project I wanted to create a simple grafical overview of an office network but unfortunately I had no nifty Microsoft Visio installed on my PC. So I searched the web for a shiny AJAX version and finally I found Gliffy.
If you just need it for 1 or 2 graphics then it does an excellent job and best of all: It is free for private use :)
CNET featured it about 2 years ago and since then the program has improved to a level that doesn't look very beta-like anymore. I am really impressed what two guys with some time on their fingers did here...
But enough chit chat, here's the link:

gliffy.com