Do you sync your iPhone, iPad, and iPod touch email, contacts and calendars from Mail or Outlook via iTunes or have you moved to the MobileMe, Google, Yahoo!, or Microsoft cloud? For many people, especially in business, Outlook is life but connecting a cable and launching iTunes isn't a very convenient way to stay current. MobileMe had a rocky start but has been stable for a while now, and rumors persist that Apple is about to re-invent it (especially now that the $99 box is almost impossible to find). Google is huge with geeks but does things in its own way and provides little to no support when things go wrong. Yahoo! was once a power house but now you almost never hear about them anymore. Meanwhile Exchange is huge in enterprise and Hotmail has become Microsoft Live Mail and is finally playing nicer with iOS thanks to ActiveSync.
When it comes to files there are even more choices. You can still sync via iTunes to apps that support it, or you can use Apple's iDisk, Google Docs, Dropbox, Box.net, SugarSync, or a number of options from Microsoft including Skydrive and SharePoint (though you seldom see any of them when it comes to iOS.)
Have you standardized on a single solution or do you use more than one? For example, do you use different accounts or even services for home, work, school, private info, etc.?
Vote in the polls and let us know the details in the comments?