Last.fm vs Pandora

We all get bored of our music collections sooner or later. Luckily these days we can resort to either last.fm or Pandora to spice up our music lives. I have over 20 gig of music on my computer but i'm totally sick of it. So I started listening to Pandora, a radio station that creates its play list based on artists or songs you recommend. While I love Pandora for its simplicity I have noticed one downfall. It does tend to repeat songs if you come back day after day. Last.fm on the other hand is a little more complicated to use, it has many more options. But these options really allow you to tailor your radio station the way you want it. And it appears it have an inexhaustible supply of songs to draw from. One more interesting point with last.fm is the way the site allows you to see what other people who listen to your favourite artists also listen to a la amazon. So at the moment my vote goes to last.fm.