If you are like me and do single or double sided homebrew boards have a look at "FreePCB" http://www.freepcb.com/
I tried Eagle and found it difficult to learn.
FreePCB will import net lists from eagle, protel, pads etc
There are many much smarter people than me on this forum, many of whom would
use Eagle, however if your needs are similar to mine have a look at it