I actually have been using Google Chrome quite a bit, and I really like it. It is very quick, and some of the little extra features have come in quite handy at times.
Before that it was mostly Firefox for the last few years. I also kept IE upgraded, as Windows Update and a few other pages (such as my employer's time card software) only display correctly on it.
I have to say though, after a little while with my new machine with Windows 7 and IE 8, the new browser really seems to run quite smoothly. I'm sure someone will reply about potential security issues, but I haven't had any trouble yet.
Also, I have had no trouble having all three browsers installed at the same time, and every once in a while, may have all three open at the same time.
All of that to say, if you're looking for a quick, not-too-many-frills browser, try out Google Chrome.
jb