If anyone is interested, I just wrote a short tutorial to slow down the fan in the 5101 using just some software modifications.

I'm writing these lines now on a perfectly silent 5101 with the single noise being my hard disk.

You can find the full tutorial here:
http://myhpmini.com/forum/viewtopic.php?f=36&t=3947

As I can't guarantee that this mod will work for all of you or even that it is secure to apply the mod:
***Please keep in mind that any modifications may harm your netbook or maybe even you or someone/something else***