Apple Partition Scheme on a MacBook Pro?!

Following one or two odd hangs and crashes with my MacBook Pro, I started to investigate correct partition methods for Intel Macs.
Peculiarly, the internal drive appears to be set to an Apple Partition Scheme, whereas I understand Intel Macs should have their drives partitioned using the GUID scheme.
It's booting okay and for most part is trouble-free, but I'm wondering if I should go through the motions of moving it across to a GUID partition? Is there a downside to using an Apple Partition Scheme on an Intel Mac?
Thanks.

Thanks for the input. I've just got the one partition, and recently had to set up that partition again because of a fairly severe crash.
In Disk Utility - Partition - Options, there are three partition options:
1. Apple Partition Scheme (for PowerPC Macs)
2. GUID Partition Table (for Intel Macs)
3. Master Boot Record (for Windows)
I didn't select any, but went with whatever Disk Utility defaulted to (which it looks as though was Apple Partition Scheme). I set up the disk by formatting it while in Target Disk Mode and attached to another machine - this may have been the problem.
If there are no known issues running an Intel Mac on this kind of partition, I'll happily keep it as it is, but because it's a 'mission critical' system I really need to sure.
Thanks again.
15" MacBook Pro, 2.33GHz, 2GB DDR2   Mac OS X (10.4.9)  

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