What's the fastest way to find a new tune you've just heard on the radio?

Kazaa went to the dogs when they started adding fakes and viruses.
Emule and Edonkey, for those who have way too much time on their hands.
Torrents, only interesting if you're looking for the whole album.

One hassle-free and straightforward way so far was to simply use Google. When used with the correct search terms Google becomes a powerful mp3 search-engine. (If you have no idea what search terms to use, like me, try smacki.com and g2p.org. They have automated this process with a simple search interface.)

Now a new engine called Tagoo has popped up on the net. The page is offered in English and Russian. There are some nice features:
You can choose to either play the mp3 directly from the browser or download it.
When you search an mp3 Tagoo gives you suggestions for other music that you might like.

Don't know how long this one will last, but enjoy it while you can.
For a nice review hop over to this Ars Technica review.
The source: http://www.tagoo.ru/en