OSH Park is a super resource for hobbyists looking to fabricate printed circuit boards.  It is a board aggregation service: you send in your design, your design gets aggregated with others' designs onto one big board, and when there are enough designs to fill a big board, the order is sent out.

Started as a part-time service for fellow hobbyists, it has grown so popular that Laen (check out this fascinating interview), the person behind OSH Park, has quit his day job to run this fulltime.  The big boards now get sent out several times a week.  OSH Park has even bought SparkFun's competing BatchPCB service!

OSH Park prices 2-layer PCBs at an unbelievably low $5 per square inch, for three boards, and throws in free shipping!  Their boards have a unique purple color.  If you see photos of purple-colored PCBs on the web (e.g. open-sourced projects), they likely used OSH Park's service.

I've tried to learn EAGLE PCB a couple of times, but each time, the learning process became its own big project, bigger than the simple PCB projects I wanted to use it for.  The user interface is most unintuitive, is quite modal, and is different from most other software you use a mouse with.

Some months ago, I learned about DipTrace.  It is a joy to use.  The user interface makes sense and is mostly what I expected (most guesses turn out correct).  When I use it, I'm able to learn just enough features for my immediate needs, and focus on my simple PCB projects.  A free, non-profit, hobbyist edition is available, and commercial editions are very reasonably priced.

I will likely still have to learn EAGLE in the long term since there are more components for which it has libraries, but in the mean time, I'm productive wth DipTrace.