I managed something today which I didn't think was possible. I managed to get my machine to use up nearly all its memory. I was testing a SideShow gadget application which starts running automatically when the SideShow device is connected. But because I haven't completed the code yet, the program didn't finish properly. So Vista started it again. And again. So I ended up with several hundred copies of the program in memory before I realised what was happening.
By the time I worked out what was happening I had 86% of my memory filled up. The nice thing is that Vista never really slowed down or seemed to suffer. I just saved my files, shut the machine down and rebooted. Which is quite impressive when you think about it.