New build suggestions please

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http://unix.stackexchange.com – I am a system admin with limited Linux experience, and have been tasked with setting up Cent OS 5.8 64bit install, and creating a template once complete. (I am the only one in the team who has actually used Linux before - sad I know!) My main client base will be developers, and I would like to be able use a separate partition for their Application installs, logs etc. So if logs fill up, it essentially wouldn't take down the system. All new systems will be created using VMware. Here's my question. Would it be best to create one drive, and just partition it off? Or should I create a second (HowTos)