Your iPad as a business productivity tool
So, you've bought an iPad and you're wondering how you can use it for business. I've had mine for about 12 months - it started off as a toy, but now it has now become an indispensable tool. Let me tell you how I'm using it. With the exception of Notes Plus for handwritten notes and iThoughts HD for mind maps, I don't use the iPad as a tool for content creation (documents, spreadsheets, presentations), I use it for content consumption.
Email and Calendar
Chances are you've already got a SmartPhone. If not, then the iPad is a lighter and faster way to access emails and calendar than your laptop. But if you do have an iPhone, Android, Blackberry, etc. you probably won't get too much extra value from the iPad here.
However, it is easier to type a lengthy email on an iPad (especially with a wireless keyboard) and it's definitely easier to view attachments like documents and spreadsheets. But this isn't the killer app for iPad.
NotesPlus for Handwritten Notes
For me, the killer app on my iPad is Notes Plus (http://notesplusapp.com/ costs $5.49). Combined with a good quality stylus, it has allowed me to dispense with a paper note pad. There are lots of note taking apps for the iPad like Evernote. But they are based on typing. I personally find typing in a meeting to be a barrier to communication. I find myself thinking about spelling rather than listening. I've been writing for over 30 years, I know how to do it, I don't have to think about it - I can focus on the conversation that's happening whilst taking notes. N+ allows me to write in an electronic format, draw, scribble, email my notes, organise my notes in folders and workbooks, sync with Dropbox (see Dropbox note later).
N+ doesn't try to recognize my handwriting...I don't want it to. If it did I'd turn that feature off or uninstall the app. I'd be back to watching my spelling. N+ allows me to write in my handwriting with all my glorious spelling mistakes. You need to read the instructions to use the software effectively. But it's the best $5 I've spent on technology...ever.
Dropbox for File sharing between PC and iPad without iTunes