I have updated my groovy tax spreadsheet for 2009/2010 planning.
Some of the details are murky since there is still legislation that needs to be passed to finalise things. I may post an updated version in this thread when things have cleared up. Same speil as last year below in quote... except now it I have been using it for 4 years!
Instructions are in the workbook itself - basically just fill in all the light-blue numbers with guesses to start with, then fill them in properly as the year goes by. Then this time next year you know where you stand tax-wise and what action you may need to take before the end of the year.