My desktop has nothing special as far as partitioning goes. My laptop, however, is a quad-boot system since I need to be familiar with many operating systems.
The partition scheme is made of (using the ever-handy GParted utility) three primary partitions and one extended partition with three logical partitions within it.
Primary Partition #1: 15GB, NTFS, Windows XP
Primary Partition #2: 15GB, NTFS, Windows Vista
Primary Partition #3: 15GB, HFS+, Mac OS X (X86) 10.4.8*
Extended Partition
\_ Logical Partition #1: 15GB, ext3, Ubuntu 6.10
\_ Logical Partition #2: 256MB, Linux-swap
\_ Logical Partition #3: 33.2GB, FAT32, Used for inter-OS storage.
To manage the whole thing, I use the GRUB bootloader. I would have used VMware, but that's too easy.
*- Technically illegal. :?