all my friends are rather busy, so the coven might not be getting together this time, i usually decorate the house, have a light meal, roast chicken but a lot of dairy. where i live it's usually too cold to plant anything, but normally one of us buys a plant, or some flowers, and we have a ceremony welcoming spring, then whoever bought it keeps the plant, or gives it away as a gift. you could also plant seeds and grow your own, but not everyone's on board with that i think.
that's a good website for ritual idea's.
i like about.com, they have good information and i like how it's presented, that's a basic what's Ostara, and some links to other Ostara topics you might find helpful. basically decorate your house in light colours, try to serve dairy products, and welcome in spring. that's all really.