I have just filed my 2009 tax return on line - having not been able to get on for the last 2 nights. It was incredibly easy. The most difficult part was the IR10, but I had printed off a copy of it and filled it out awhile ago. All the main calculations are done by the programme and it works out your tax or refund. I've been doing my GST on line for a while, but this was really easy. Much cheaper than getting an accountant to do it - especially when I get all tax paid back.
And I sent 4 cattle to the sales today and got great prices for them, so I'm feeling pretty chuffed tonight. Don't have to pay taxes on selling them til next year!