What time of year I hear you ask? ... Well Tech.Ed registration time of course !!! For the actual event, you will have to wait until the 7th August.
Tech.Ed early bird tickets will go on sale on 16 April (with some nice $$$ savings) and the official customer site www.microsoft.com.au/teched will launch on the same day.
So... stick April 16 in your diary to take advantage of the early registration deals. You can also pre-register now to be first in line for early bird tickets.
Also... I am owning the Connected Systems (aka BizTalk, WCF, WF, CardSpace and HIS) track this year ... So if there is anything you want, don't want etc. to see in this track... Let me know.