Dual Booting Ubuntu as secondary on HardDisk

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http://askubuntu.com – I have two linux distros that I want to dual-boot off a single 140GB serial ATA drive what I want to do is set up both distros so that I can boot either of them whenever I start up, I've done this with windows which was fairly simple since all I needed was to install the distro on a seperate partition and it pretty much did this all automagically but at this time I have a Linux OS and I want to boot Ubuntu as a secondary OS, how would I go about doing this, how would I have to partition my drive and what set up would I need to get them to dual boot, I have no problem re-installing my current (HowTos)