Wirelessly posted (Mozilla/5.0 (SymbianOS/9.2; U; Series60/3.1 NokiaE71-2/100.07.76; Profile/MIDP-2.0 Configuration/CLDC-1.1 ) AppleWebKit/413 (KHTML, like Gecko) Safari/413 UP.Link/6.3.0.0.0)
I use FF as my primary browser (Ad Block Plus makes that a no-brainer for me), but I also use the other two browsers. I use Chrome mainly as my GMail reader, but will use it for other sites on occasion.
Also, for me, there are a couple of reasons why IE is essential. When using the Webmail function to read my company e-mail, IE works best. And most importantly for me

the Metropolitan Opera's paid video site, MET PLAYER, requires IE.