I didn't fully investigate your link there but I perform my own tune up. Frankly I have found ready boost to be useless if you have 2GB of ram as I tried it with my Desktop and Vista Ultimate x64. There was no speed increase with a 1GB flash drive devoted to Ready Boost. As for less RAM, it probably is a good idea.
I don't mean to overtake your advice here but I would like to share how I optimize my pc:
--Run->msconfig
Under services turn off all that you don't recognize but can figure out what it does(google helps). Under start up, turn off all things you don't use. No need for any program to start up at start up if you don't use it as soon as you turn on your pc.
--Under Vista: contol panel->remove programs.
On the left you will see Turn Windows Features on or Off. Here you can turn off things you dont need from the OS. HTML printing for printing over the web? No I don't need that, XPS document viewer? Not sure what it is but haven't been unable to view anything since I turned it off.
You'll be surprised at the amount of stuff that runs without your knowledge. Most of it is useless to the common user too. Going through this tune up should make a noticeable speed difference.
Also don't forget to defragment your pc! I found a nice defragmentation tool online for all versions of XP and Vista: JkDefrag
http://www.kessels.com/Jkdefrag/
It even optimizes your drive for quick access to the files you use most. I use it and it makes a huge difference in performance. It even is faster than the standard Defragmenter in Windows.
EDIT: PEASE READ KNOWN BUGS SECTION FOR JKDEFRAG BEFORE USING. Some bugs are known to completely corrupt HDD's. Back up your data before using, just as you should anytime you defragment.
Think outside the box.
To go on an adventure, one must discard the comforts and safety of the known and trusted.