Triple boot XP, Windows 7 and Ubuntu

#1
I am currently dual booting Windows XP Professional and Windows 7 Professional (both 32 bit) on a Dell GX620 with 3GB RAM. Each OS is in a separate partition and I have a third 80GB partition that I would like to use for Ubuntu.

I am currently using EasyBCD 2.0.2 and iReboot and everything works great.

Is there a Stickey or Instructions for installing Ubuntu on a third partition and not have problems with the GRUB bootloader and be able to reboot into another operating system as easily as I can with XP and Windows 7?