(I'd make my own, but my previous efforts at home T-shirt design has been somewhat underwhelming.)
Here's a few: http://www.cafepress.com/aspies
Various designs http://www.cafepress.com/proudlyautistic
And this place has tons of stuff http://www.autismapparel.com/
-- as always, it's important to check out where your money's going. I wouldn't send my $$$ to curbie organizations
Ooh, I just realised that you're a Queenslander! I'd be happy to volunteer when the opportunity arises, if you're close enough to Brissie...
I know Adelaide doesn't get involved in much, but perhaps I could change that?!

June 18th - Still a long way away...
So, we could potentially do the 'If you'd like to talk to a local Aspie...' thing for then?
*grins* It's a deal.
Here's the link to info about Autistic Pride day: http://en.wikipedia.org/wiki/Autistic_Pride_Day
How much should the autistic community 'vet' individuals on the spectrum who wish to act as spokespeople on autistic affairs? I predict two problems:
The obvious one: Someone who is on the spectrum but also happens to be a complete crackpot, stands up and spouts off, and sets the cause back 20 years by saying things like "we are the master race and hate all NTs", and getting a lot of negative attention.
The less obvious one: We're all really different. Whoever acts as spokesperson, someone else is going to argue that they're not fit to speak for Aspies as a whole because they're too highly functioning, or not highly functioning enough, or their social skills are too good or not good enough, or they don't stim in public enough or do it too much, or their sensory issues are too mild or too severe...
I think a lot of the issues would be solved by a strong emphasis on AFF being the organisation represented. This would mean that in the first case, representatives from the site (probably Gareth & Amy) could issue a public statement disassociating themselves from the views of the spokesperson.
The second instance is kind of inevitable - the best way to deal with it is by having a few different spokespeople to call on. For instance, if people start saying that someone isn't "highly functioning" enough, have a more "usual looking" person to back them up, or vice-versa. Same with social skills & other behaviors.
Daft question I suppose, but are you thinking of spokes people who are AFF members?

But I could & would help in other ways.
I'd be hesitant to speak on behalf of AFF, unless Gareth or Amy or someone else in charge actually asked me to. It's their ship, after all, we just hang out here. But, where I live at least, there's nothing in the way of an organised group of people on the spectrum - be that educating-the-masses type activities, or just getting together for fun and support. I guess I should pop over to the 'local groups' forum and start a thread, shouldn't I?
Good point, but I'm pretty sure they'd be fine with it if you asked. I tend to think that as the group gets more recognition, eventually it's going to come to the stage where we'll have to have organised spokespeople in different areas.