Information:

- 64-bit/32-bit thing:
Mac OS X Snow Leopard is a hybrid operating system which can boot in both 64-bit and 32-bit modes. This iATKOS S3 release boots in 64-bit by default, if you select the 32-bit package or any of the 32bit-only driver(s) then the system will boot the kernel in 32-bit by default.
To load a driver/module/kext in 32-bit (i.e. a 32-bit only driver) you must boot the system in 32-bit, vice versa for 64-bit. All of the drivers and patches except the 32-bit only ones in iATKOS S3 are hybrid (64/32bit), this means you can load/use them in both 64-bit and 32-bit modes.
64-bit applications can run in 32-bit mode and vice versa for 32-bit applications, but modules/drivers/kexts will be loaded as the same architecture (64-bit or 32-bit, in other words x86_64 or i386) you boot in, 32-bit modules in 32-bit mode, 64-bit modules in 64-bit mode. Therefore applications that need their own 32bit-only modules (kexts) may fail in 64-bit mode. If you choose any of the 32-bit packages during iATKOS S3 install, then your system will boot in 32-bit mode by default.

- iATKOS S3 includes scripting and many actions for using software updater just like real Macs on most PC hardware. This is mostly possible like the old releases of iATKOS but we can never know what Apple will do in next main system update, so it may not result in 0 success. Please read the related section below.

- You can make upgrade or refresh installs to your existing OSX86 system using iATKOS S3 DVD. Please read the related section below.

- Easy installation on Software RAID volumes, nearly all procedures automated. Please read the related section below.

- GPT (Guid Partition Table) and MBR (Master Boot Record) partitioned harddrives:
GPT is a partition table type for x86 computers which is also Intel Mac's partition table type. Its structure is different from MBR and so it has some nice features. The whole GPT multiboot procedure may not be so friendly for newbies, so they should go on using MBR, performance of the system will not differ from GPT to MBR.
MBR has a limit of 4 primary partitions (which is a must for booting an OS, however linux can boot from logical partitions by MBR) but GPT has no such thing like primary or logical, therefore you can create up to 128 bootable partitions on GPT disks. HFS+ partition resizing is only possible on GPT drives and it is such a comfortable feature. All windows series (win 3.1, win95 and win98 are MBR only) can be installed to a Hybrid GPT drive which can be easily created using OS X disk utility, just create one or more FAT32 partition(s), make sure that they are at the first 3 order and there you have the Hybrid GPT for windows installation.
New Linux bootloader Grub2 supports GPT, so nearly all updated Linux distros can be installed to pure GPT drives.
For Software RAID feature on Leopard and Snow Leopard, you must have GPT partitioned drives.
In the near future, most of x86 computers will run on GPT drives.