Even with 8GB of Ram in my system, I'm always looking to keep my profile as small as possible and keep my memory for the important stuff like Photoshop. So I've been trying to Emerge Desktop for the last couple of days. I'm really like the fact that on one monitor of a three monitor system, I basically have everything I need for monitoring and controlling my system, thanks to Rainmeter and Emerge.
My only complaint is that every time I play a full screen game or I come back from hibernating my computer, I lose either my launcher or my tray. Sometimes the bars are still there, but I cannot highlight them. Other times they are completely gone. Also, while I have only two Launchers active, it's showing 3 Launcher.exe's in my Task Manager.
The monitor that I have Emerge and Rainmeter on is not my primary monitor. I also have Emerge installed on my D: drive under Applications instead of C:\Program Files. Finally, I'm running Comodo Internet Security, but I made it so that it allows for all parts of Emerge to have complete access to my system.

build 6.2.0.1338
XP Pro x86 SP3