Oxfam's Fair Trade Fortnight 2010 runs from the 1st to the 16th of May. This year, Oxfam is asking you to take part in 'The Big Swap' by swapping as many of the products that you usually buy for Fair Trade products.
This might involve buying products such as tea or coffee from Oxfam or other Fair Trade suppliers (many grocery stores now carry Fair Trade products, too). It also might mean checking whether the clothes you buy are certified under a scheme like Australia's FairWear project.
Even if you're just swapping one of the things you buy for a Fair Trade product, you're helping to support the people who sustain you.