I now use several browsers to surf the Web on my MacBook Pro:
Apple's Safari is my default browser. It's the browser that is launched by links in e-mail, and it's what I use for general surfing of news, shopping, and other stuff. For me, Safari is faster than other free browsers, although it is often the last to be supported, or is unsupported, by third-party plug-ins. I also like the fact I can effortlessly sync my Safari bookmarks via MobileMe with my iPhone, on which Safari is my only browser option.
I use a Mac beta version of Google Chrome to manage my work with Google tools, mostly Google Reader. Not unsurprisingly, Chrome seems to render all things Google faster than other browsers, though I'm not sure why that should be.
I spend a lot of time with Reader, using it to scan about 80 RSS feeds several times a day. (On the iPhone, I use an app called Byline to manage Reader RSS feeds — best of class for mobile, as far as I'm concerned.)
I also use Chrome to manage several Gmail accounts. Gmail is not my primary e-mail tool — I use it for backup, archiving, and searching. I still use Apple Mail to manage several conventional e-mail accounts, and Apple iCal, which I prefer, to manage my life in meatspace. (Getting iCal and Google Calendar to talk to each other is a pain, and until it isn't, I am sticking with iCal.)
I use Firefox to manage this blog, mostly because it accommodates so many plug-ins for third-party tools, including Zemanta, which is a pretty cool links-and-images tool for bloggers. Firefox is the most capable of all the browsers, but that makes it the most complicated for normal people to use. It's slow and takes forever to launch.
On the Windows side, I try to use Internet Explorer as much as possible because I like to keep up with what Redmond is doing and because it works best with Microsoft's various Web sites, which I visit regularly.
But I also have Google Chrome and Apple Safari installed on my Windows partition. Safari is useful there because it automatically syncs with my Mac-side bookmarks via MobileMe. Chrome, again, is set up almost exclusively for managing my various Google tools.
For e-mail on the Windows side, I use Outlook. I think Outlook is the most overly complicated application ever created, but it's a standard in the business world and I want to remain familiar with it.
What do you use, and are there better tools out there?