Here you can find two separate sowing guides, one put together especially for us (and available to download in pdf format) and a different one reproduced with permission from Steve Solomon's "Growing Vegetables South of Australia". Also included here are two links:
A sowing calendar put together by the local seed company Southern Harvest (http://www.southernharvest.com.au/sow_now).
Peter Cundall's Planting guide from the ABC website (http://www.abc.net.au/local/stories/2008/07/07/2296755.htm?site=hobart).
Between the four of them you should be able to get a pretty good idea of the best sowing times for most crops in South Hobart.
Steve Solomon's Planting Guide from "Growing Vegetables South Of Australia".