i use it in place of my lappy. i still need my desktop comps for work of course, but the ipad is always my best friend on my desk every day.
in business i use it daily as a coms port basically. Business planner/diary, emails, skype, messaging, internet etc etc. i also use it for invoicing and business letters. and it's used for my accounting (via Office2HD excel files), although i'll soon be trying Numbers on my ipad instead.
in pleasure we use it in the home for watching movies and tv catchup (BBC iplayer, ITV player etc) via HDMI cable to TV. Home emails, internet and internet shopping, BBC news, Skype, sometimes games, weather, trip planning, video/photos, home accounts etc etc.
There basically nothing my laptop can do that my ipad doesnt. my laptop is now retired.