I am loving Avast as well... AIS is pretty neat.
(Yeah, there's almost always room for improvement in a program, but I still like it very much.)
For a long time, I have been looking for a nice all-in-one suite because it gets pretty annoying when a lot of programs must start with the system.
This is one piece of software that I am actually enjoying testing on my equipment.
So far, I've tested AIS on an old:
1. Sony RS220 desktop (P4 2.5 Ghz, XP SP3, 1GB RAM)--very pleased with the startup time of the system
2. HP Compaq TC1100 (P-M 1 Ghz, XP SP3, 1GB RAM)--very pleased here as well
3. Dell 600M (P-M 1.6 Ghz, XP SP3, 2GB RAM)--eternally slow no matter what I've used on it.... ~shrugs~ I might see if I can find a lightweight Linux distro for it or test Haiku on it....
I did want to test AIS or some other Avast product on a Tatung TX-2000 Web Pad, but I'm not really sure about that one yet. XP-e is not on it, so I may have to consider nLite/vLite, HFSLIP or something else.... However, I am seriously looking forward to seeing how AIS performs on a Dell Mini 9 with Vista.