I'm a licensed NOD32 user, but came back here due to a few 'niggles' with the aforementioned...
I'm running the latest build of Avast (Free) on Win7 (32 Bit), browser is FF (I.E removed) + Thunderbird (with Avast managing the SSL accounts). I have to say, on footprint, speed / performance, effectiveness (running a few 'tests' with Eicar, Spycar etc... and checking out the 'official' reports), plus general usability & configurability - I'm extremely impressed. And this is a free product! Thanks!
(Feel free to publish my comments - if you so wish, minus the mention of 'the competition'!)