Amplifier for a desktop?

[#1]

Any suggestions for an amplifier for a desktop?
I have two good (Technic) bookshelf speakers that I would like to play
the pc through.
Is that possible without hums & buzzes?

[#2]

Just use an amplifier that has a Line or Aux inputs, any stereo amplifier should work fine, any buzzes & hums though are usually down to bad wiring or a poor quality soundcard...

[#3]

I use one of these Logitech systems...sadly no longer available.
A similar item should give very good results. I'm very happy with mine.

[#4]

I have this set http://www.microlab.com/?r=51systemen&st=full&id=361  and as its amp is separate you can plug any speakers in  
But if you want you can just buy a separate amp from most HiFi shops with a AUX in and connect to your PC  
i found this a helpful shop http://www.richersounds.com/products/hi-fi-separates/separates/amplifiers-receivers ;  

[#5]

I'm using my amp from a separate setup and it's working fine.

[#6]

You may be able to do something with this....
http://www.maplin.co.uk/p/18w-universal-amplifier-module-n66aw
input voltage is rated at 8 to 20v.... ( max power output would be on 20volts)... not sure how much power output you would get if you ran it off a 5v rail from the computer... 
Or you could run it from a couple of 9v rechargables
I used something similar in my old Skoda.. ( radio did not work,.. so used an MP4 player for entertainment).... using a 9v battery ... all it needed was a volume control/with on/off    ... 9v battery, and a couple of speakers...
However... this one can run on 5v.. and looks pretty good on the write up below the pic...
http://www.maplin.co.uk/p/adafruit-stereo-20w-class-d-audio-amplifier-max9744-a54qn
They include a volume control with the board...

[#7]

You can probably get a good quality old one on Freecycle.
Or try something based around the Tripath 2020A/2024/A.  eg
http://www.ebay.co.uk/itm/2-15W-TA2024-Tripath-Class-D-Digital-Audio-Amplifier-/350593209973?pt=LH_D...
http://www.ebay.co.uk/itm/Lepai-Tripath-LP-2020A-Class-T-Hi-Fi-Stereo-Audio-Amplifier-with-Power-Sup...
http://www.amazon.co.uk/TA2024A-Tripath-Class-T-Amplifier-High-Fidelity-Black/dp/B00LHB3KYE/ref=sr_1...
Amazingly cheap and surprisingly good.