i still use IE for most, but for forums, i stick with firefox. firefox + adblock + adblock filter = NO popups/ads.
IE takes less memory, and although i have 768mb of ram and 2.6ghz, it takes a couple seconds to open firefox when i doubleclick the icon, compared to less than a sec when i open IE. anyone know what i'm talkin' bout??
hopefully the new IE won't be too much of a memory bogger. i'll probably check it out when the official version comes out.