Mail.app and Mail on iOS. I wanted to switch to Sparrow and Sparrow for iOS but I really don't have a reason to besides shiny new software syndrome.
Default on OSX, Mail.app. But I guess most of my mail is dealt with on my iPhone
On my MacBook : Sparrow
On my Linux box: Firefox, because Thunderbird is really bad at handling Gmail&Google App IMAP accounts (well, it's not Thunderbird fault, but still...)
Sparrow on OSX and iOS, with gmail in chrome from time to time. Sparrow is just brilliant, would really recommend that people give it a try.
Mostly Gmail via Chrome on Snow Leopard, supplemented with Sparrow to clear out the inbox from time to time.
I use Sparrow on OS X. Had it for about a year, I think. It's really quite pleasant to use.
There are other email clients? LOL. (I use the web interface through chrome on ios and osx)
A web browser to access GMail.
I don't know what I'd do if I needed a real client.
Do people really not mind having their mail take up space on their HDD/SSD?
Sparrow, primarily. Mail on iOS, sometimes. Otherwise, Chrome.
Opera Mail currently, trying to find the time to learn mutt.
a mixture of mail.app, mutt, and thunderbird at work because I despise outlook
I use the Mail app on my mac
Thunderbird.
Same here, I use Thunderbird with DavMail on OS X.