How do you send an internet stream into a hi fi?

Supercheap way is to get a mini output male headphone to female rca cable then run rca to your stereo. Its cheap to try before you spend more.

There are a number of music streamers now on the market, in different price ranges. Try to Google a little bit and you will probably get better advice from the forum if you close your question a litlle bit.

Here's a recent thread that may be helpful: http://forum.audiogon.com/cgi-bin/fr.pl?htech&1328735094&openusid&zzSfar&4&&

I use the Outlaw Audio OAW3 wireless system to stream internet radio to my 2 channel system. I think the only issue is I'm at the mercy of my laptop's DAC. I'm not sure though.

I've heard about the sonos music streaming kit, which is a good option.