Anatomy of a Wormbin (well, ours anyway)
Here's how our wormbin works:

The
basement catches wandering worms and excess water.

The
middle tray is where you start your worms when you first
get the bin.  When its full, add bedding to the top tray and start
adding the food there.  The worms will travel up to the new food
source and the middle tray will become the compost catching
tray.  

The
top tray is where the worms eat, hang out, and fill out
applications to law school.  When its full, collect the compost
from the middle tray and cycle it up to be the new top tray!

Repeat.  Simple eh?
 Can't I Just Make My Own?
That's got to be the most common question we get.  Short answer is yes, you can!  Just head to WalMart
and drop about $30 for a stack of cheap plastic containers and drill lots of holes in them.  Heck - for that
matter you can just use a cardboard box!  There are a lot of different methods and everyone has their own
theories; gallons of virtual ink is spilled all over the internet on that score and we won't add more.
The case FOR making your own
1.  Commercially available bins are expensive!  
The cheapest one we've found locally is $99 and
doesn't even include the worms!

2.  You're the kind of person that dances to the
beat of your own drum; you have your own
theories and you're going to prove them!

3.  You take, "Do-It-Yourself" to whole new levels
of meaning.
 (In need of medical help, i once
made my own x-ray machine... i can sympathize!)
The case AGAINST making your own
1.  Our bin is only $48 and includes not only the
bedding, a laminated card for reference, and a rather
nice cover, but it also includes the worms!

2.  Although you have your own theories, you want to
get one started from a known working source to have a
ready supply of worms to test your own bins.

3.  Drill holes?!?!?  Glue & paint waterproof
bottoms?!?!?  Router and table saw for a nice cover?!?  
NO WAY!!!