IE7 is pre-installed with my Vista. But, I never used it and I won’t. (I would agree that it is quite light on resource). If I am forced to use IE (let say, for web development), I will use Maxthon (previously, myIE2). I would like you to give it a try.
Firefox 3 is much better than its previous version 2. It does perform better. People love Firefox primarily due to its add-ons. my guess. (Some of my favourite add-ons: ImageZoom, FireBug, DownThemAll, and FastDial).
But, hmm, Opera 7.5 began to support Burmese unicode font. Lack of that support was the only reason I did not use Opera before. More, I feel that Opera font rendering seems nicer than Firefox’s. I like Opera’s SpeedDial but Firefox’s FastDial works similar way, too.
I use Safari just to access my Google Reader. Google Reader looks so good in Safari. But, Safari Still crashes now and then. But, web page rendering speed is really satisfactory. But, Firefox 3 and Opera 7.5 still can compete with Safari 3 for page rendering. They all are generally getting better.
I don’t use Flock.