disclaimer: I have not read through all of the posts, so someone could have already suggested this. Sorry if that's the case.
I would love to see a series of tech tips dealing with the ins and outs of testing, tweaking, and troubleshooting a system.
I liked the series on common pc building mistakes, something like that for stability testing and tuning a system (assuming fresh install of software). Something I could send to my buddies to guide them on running through some long-running tasks (ex., memtest, cpu burn-in).
How to isolate a bad memory module
How to install an optical media drive
Regards,
Tim