Realdriver (finally with a real drive, hehe),
In my experience, one thing that can solve brake squealing is to reverse and brake hard a few times (not on the road, I usually do it in the garage at work... )
Now, before you think I'm trying to pull an april Fool's Day joke on you a few days too late, I'll explain why:
When you brake, for everyday use, you only use a small amount of the brake force available, this leads to a buildup of 'stuff' (think that's the technical term) on the brake pads, especially on the rear wheels, seeing as they hardly get used (because when you brake the weight moves forward as I'm sure you know). This leads to brake squeal, which an be very annoying I agree!
Try it, used to work on my Barchetta! The only permanent solution I know is to change the pads to a type that doesn't make as much 'stuff' as the original ones, I've heard EBC's 'Green Stuff' pads have worked for many...