To answer your question, Yes, you can put a 7200RPM into your MacBook.
It is because of the 7200RPM spindle speed of your HDD, this makes your MacBook vibrate even more than your stock HDD.
I've used a WD 320GB 7200RPM HDD and installed it into my MacBook 2.4 Alu,
I took it off because the vibration it gave out was too uncomfortable for me.
If you willing to trade the quiet-ness for speed, by all means go ahead.
Applications on a 7200RPM HDD are more snappier meaning they are more responsive.
Now, I'm using a 500GB 5400 RPM WD Scorpio Blue installed into my MacBook which is quiet and quite fast I would say and for the extra 180GB you get.
For RAM, I'm using Crucial RAM 2X2 2GB=4GB.
I'm using this since the 1st day I got my MacBook Alu from Machines as I requested for an upgrade on my RAM.
Regards.
but i m asking tat is kingston value ram compatible with the macbook alu 2.0ghz