Time Machine with 3 hard drives + Dual boot Leopard vs Tiger questions

My situation began with two 160GB HDDs that I have been using under Tiger. One is the boot drive and the other is a data drive. I bought Leopard and also installed a new 320GB HDD but as yet I have not done the OS upgrade or even formatted the HDD. I need to gain some understanding before I proceed. My first choice is just to clone Tiger onto the new (bigger) HDD and then upgrade it to Leopard. (Note that this post is not meant to be a discussion of the best way to get the OS upgrade completed.) After that I could wipe the two 160 giggers to serve as backup space for the 320, but can anyone tell me: Is Time Machine compatible with using multiple HDDs for backup data? It may not be as relevant if the first answer is positive, but I also would like to know: Does Time Machine requires use some kind of special hidden partition for storage (or is just any empty space on an HFS drive sufficient)? If any HFS space will work, will Time Machine preserve the other files that are already there? And lastly, if I reboot into Tiger, mount the drive that has the Time Machine archive on it, and write/delete/edit the non-Time-Machine data there, will Time Machine freak out the next time I use it in Leopard?

...snip...
After that I could wipe the two 160 giggers to serve as backup space for the 320, but can anyone tell me: Is Time Machine compatible with using multiple HDDs for backup data?
Yes this will work AOK. Have done this myself so can confirm.
It may not be as relevant if the first answer is positive, but I also would like to know: Does Time Machine requires use some kind of special hidden partition for storage (or is just any empty space on an HFS drive sufficient)?
No special 'hideden' partition required. It simply creates a specially named folder to keep/manage its data backups.
If any HFS space will work, will Time Machine preserve the other files that are already there?
Yes it will.
And lastly, if I reboot into Tiger, mount the drive that has the Time Machine archive on it, and write/delete/edit the non-Time-Machine data there, will Time Machine freak out the next time I use it in Leopard?
No it will not.

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Hi Adam Jackson, nice site you have and thank you for taking the time/effort to provide the information. It is very informative and valuable!
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http://discussions.apple.com/thread.jspa?messageID=8650723&#8650723
http://jamesshore.com/Blog/How-to-Accelerate-Time-Machine.html

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Hello guys, I've been facing an issue here
I bought an SSD 2 years ago and changed the original MBP HD. I did a fresh install of OSX while still having my optical drive. Everything is fine with the OSX installation.
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My question here is, is there any fix to the BootCamp assistant to let me install windows on the hard drive that it is located on the disk 1 position?
Moreover is there any way to install windows through the environment of OSX with the use of a VM, but, the windows to be a bootable OS rather than a VM bootable image? (on disk 1 - optical drive SATA port). - What I mean by that is, while running OS X normally on disk 0 run a VM software that will mimic the environment of a bootloader so that I can install windows on disk 1, but after I shut down my computer, windows should be accessible on disk 1 as a normal installed OS.
Sorry for the long post and thank you very much for your time, any suggestions would be really helpful.

You can install Parallels or Fusion, either will work. When you setup either Parallels or fusion you can tell it to use your already installed Boot Camp installation of Windows as its target guest operating system.
You would then just boot into OSx, start your VM (Parallels or Fusion), then you'll have access to both OSx and Windows without having to reboot.
I have this setup and two monitors. I have my Windows running on my external monitor and OSx running on my Macbook Pro monitor at the same time.
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