BTW, the link to audio on Slug that lardman posted links also el-cheapo usb sound card
http://www.dealextreme.com/details.dx/sku.5831
While I have quite good experience with dealextreme overall (14 orders so far, mostly more than 1 item, everything arrived, price/quality ratio is quite good, they send replacements for free) I was unlucky with this one. Got first one with attached but unsoldered usb connector and after soldering it didn't work anyway. They happily sent another one for free. That one worked but the audio was very distorted in headphones. They did not sent third one :-) But this was the only crappy thing I got, other stuff was better. You may have better luck with this item than me, it has good user rating so others had better luck.