Dual boot 10.3.9 and 10.5?

I have a 12-inch powerbook G4, and I'm still using OS 10.3.9 because my Pro Tools hardware and software don't support more recent versions of OSX. I'm starting to feel behind the times though, and I'd love to be able to use 10.5. Can I have both 10.3 and 10.5 on my computer? I'd like to use 10.5 for everyday things and then go back to 10.3 just on occasions when I need to use Pro Tools.
Is this feasible? How would I go about doing it? Do I need install discs for both versions of OSX? I have a pretty big external drive that I can use to store the data i have on my laptop while I work this out...
Thanks --
Joe

You can dual boot. I'd suggest getting an external Firewire (not USB) drive. There are two reasons for this:
1 - Firewire is noticeably faster (yes... I know USB 2.0 is faster in theory... but USB 2.0 has a lot of overhead that Firewire doesn't have. If you go google for comparisons between Firewire 400 and USB 2.0 you'll find that Firewire consistently outperforms by a wide margin. How wide of a margin depends on the type of test (e.g. was it one really really big file being transferred vs. lots of very tiny files, etc.)
2 - I think I recall that the PowerBooks can only 'boot' from external drives if they are Firewire. You might have to check on this... but I think you may find that booting from external USB is only supported on the newer Intel macs.
You can format and install the OS of your choice on the external drive. I know the modern Macs prefer that the drive be formatted with 'GUID' partition scheme. Older ones used APM (Apple Partition Map).
Once you've done that, when powering on your Mac remember to hold the 'Option' key down. This will cause the Mac to display all bootable devices (rather than just booting off the default device). You can then select the device (use the arrow keys to highlight the drive of your choice) and hit the enter key and it'll begin booting.
Although you have a laptop, I'd suggest that you get an external drive enclosure intended for desktops. That's because these have (a) their own power supply -- so they're not drawing power fro the Firewire bus, but more importantly (b) because they almost always have their own ventilation and fan. The portable external laptop drives are generally in small, sealed, fanless cases. That's fine for occasional disk use, but when running an OS off the drive it'll be under very heavy use and may get quite hot -- causing premature failure. Oh... reason (c) is that you generally pay a premium for the 'portable' design factor. Desktop external drive & enclosures are usually cheaper!
I own a Maxtor OneTouch III Turbo -- but I'm very disappointed that Maxtor/Seagate has still NOT released a working driver for Leopard (I have to boot Tiger to be able to change the raid configuration) after all these months -- and are silent as to the status. It's NOT ok for a backup drive company to not have a working driver for a major OS update and then remain silent about it to their customers.
I also own three 'MiniStack v2' drives from Other World Computing (macsales.com) and have been extremely happy with those.
If performance is a big concern you may wish to purchase an external drive enclosure that supports "RAID 0" (striping).
Regards,
Tim

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    Unused node is not erased (node = 40)
    Checking catalog file.
    Unused node is not erased (node = 30)
    Checking multi-linked files.
    Checking catalog hierarchy.
    Checking extended attributes file.
    Unused node is not erased (node = 8)
    Checking volume bitmap.
    Volume bitmap needs minor repair for orphaned blocks
    Checking volume information.
    The volume Samsung SSD Daten was found corrupt and needs to be repaired.
    Error: This disk needs to be repaired. Click Repair Disk.
    Verify and Repair volume “Samsung SSD Daten”
    Error: Could not unmount disk

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