In addition to what wayland++ said, there's also the fact that the Perl 6 implementation on Parrot, called Rakudo, is intended to be able to mix programming languages with great ease. For example, one syntax that's been bandied about is this:
use v6;
# Perl 6 goes here
{
use P5;
# Hey, now I'm writing Perl 5 code!
}
# I'm writing Perl 6 again!
The amazing thing is that the object models will be able to interact, which means that CPAN modules will be trivially usable. That's a different kind of interop from what I showed above, and it's working (to a degree) now. Of course, the languages it works between are Cardinal (Ruby on Parrot), PIR (Parrot's native language), and Rakudo (Perl 6 on Parrot). The syntax is currently like this:
use opengl:from<PIR>;

GP using the word 'troll' could have been a cleverly constructed joke, seeing as prior to being bought by Nokia, the employees at TrollTech were known as 'the trolls'. Not sure I believe it is a joke, though.

I think you accidentally a word.

There is no myth. I benchmarked it - under sustained writes, reads go very slowly indeed. Large sequential writes get very poor throughput as well.

On Windows > XP, not at all. On XP, a little tougher. On OS X and Linux, much better, because you don't need to install a new piece of software to access, and native UDF is much faster than ntfs-3g.

It will probably be much easier to develop an exFAT driver in kernel space, because it's very similar to FAT. This will, again, give a performance benefit relative to ntfs-3g

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Basically, everything even half-modern except Windows XP supports writing, and everything half-modern including windows XP can read v2.0 and down. See the relevant Wikipedia article for more specifics. There are third-party drivers for XP, so your best bet is probably to either:

a.) Format it as UDF 2.0 or less, and put a write driver for XP on it. This requires admin access to the XP computer.
b.) Split it into a small FAT partition and a bigger UDF partition. If you can't write to UDF, save files back to the FAT partition instead. This variant works on computers where you have no admin privileges.
c.) Wait until a read/write driver for exFAT hits OS X and Linux (Linux already has a read-only driver for exFAT)