The AUD and USD currencies keep going up and down, left and right, it’s crazy. Has it affected your business at all with international clients over the past 12 months? Are you an Aussie that charges in USD? Are you an American that outsources to (sometimes) cheaper Australians? Please share your story 
I don’t believe that’s true. I charge in USD as well. When the difference would be to my advantage, I get fewer RFP’s. When it is to AUD advantage I get slammed with them.
All my contracts are in USD, so i must say that on the last months, the curency has been good for me, though in the last month it got low. Now talking on the other side, of buyers, this is not a good fact.
Though for sellers , it is.!
For me, because the US dollar is getting weaker I see more European buyers. When that reverses, I’ll see more US buyers. In either case I do fine because people from all over the World use our products.
What’s most driving me crazy is that lots of vendors are suddenly trying to be currency speculators and wanting payment in different currencies.
For example, one vendor is convinced that the dollar will crap out vs. the euro so they want Euros - but of course the Euro took a dive for a while and they stressed out hugely. Another vendor wanted payment from our Thai baht account, which is nice for me, but when the baht dropped suddenly they panicked and wanted dollars. And it goes around and around like that.
I treat the recent currency volatility like I do any other market fluctuation: hang in for the <reasonably> long term and don’t flee a market or currency unless something dramatic happens. So far, nothing all that dramatic has happened in the currency market unless you watch too much MSNBC.
But yea it’s very strange seeing how the currency fluctuations change the numbers!
I’m in the UK and the bouncing currencies have certainly affected my business… rather than having a guaranteed sum in my PayPal account I now have to account for crazy fluctuations in how the resulting amount will turn out. I think the record was one time I literally saw an 8% drop in the amount I got from a fixed sum. 
I dont see any problems with a vendor changing to a different currency as long as they stay with it afterwards. However if they are jumping back/forward as you mentioned within a few months I would get annoyed.
Personally we changed from charging our international customers from USD to Euro back in late 2007 / early 2008 (Cant remember exactly when, was when the crisis started), as USD dropped with over 30% towards NKR (Norwegian currency) in less than three months. Our case was special as the same time USD declined, NKR got stronger so the difference between the currencies really changed fast.
Our choices back then was to either keep increasing the hourly fee to keep up with the decline of the USD towards NKR, or to change to Euro which was relatively stable.
To make everything easier for both us and our clients we changed to Euro. Its worked out pretty well for us, with the exception we had to explain that there was a difference between USD and Euro to some US clients we got after the change.
As Sagewing mentioned, unless we notice the same decline with Euro as we did with USD a few years ago, we will stay with it. There is no use in changing currency every second month to earn a few percentage more, you would just drive your clients insane doing that.
really? quantitative easing 2, QE2, the US is printing $600 billion between now and June. Some have estimated that this single act alone will devalue the US dollar 20%. Sure, fluctuations can happen all the time, but the trend for the US dollar is down, down, down.
Hopefully this ends up helping me out, as I’ve got fixed price contracts for my hosting expenses for the next 1-2 years. If the dollar falls, and my ad revenue in Turkey goes up (in dollar terms), while my hosting costs stay the same, my profit margins improve.
Now, I’m not asking to be paid in Turkish Lyra, but some advertisers will only pay in that. And even when they pay in dollars, the competitive market for advertisers in turkey is very much interested in the value of the turkish lyra, so no matter how you slice it, the currency value affects me.
A significant portion of my income is in US roubles and so as they descend toward worthlessness my income when converted into real AU dollars is steadily falling even though it looks to those providing the income as if it is increasing.