When Building my boxes I use biscuit joints. Biscuit joints are a little tricky, but they hold better than glue, nails, screws, loc-tite, or any other fasteners i've ever seen.
To make a biscuit joint first use a special $30 tool called a biscuit cutter to cut 2"X1/4" slots along the mating edges of the wood, one cut every 4".
Next you fill the slots with wood glue, the glue is part to hold and part to cause the biscuits to expand.
Now place biscuits (little pieces of special wood designed to fit in the slots), into the slots on one side of the joint.
Place the two pieces of wood together and continue doing this for all joints, then clamp it all together. In about 25-30 minutes you'll have a joint that Sampson couldn't pull apart.
No screws, or nails are needed. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
The whole job only costs a few pennies in the end (not counting the cutter) and will hold better than screws.
What happens is when the biscuits come into contact with tyhe glue they start to expand, after they've filled the slot you cut earlier they put pressure onto the wood around the slot. makes a very solid joint. to see a good example of how this works, take a piece of 1/4" wood and clamp some visegrips onto itas hard as you can, now try to pull the wood out of the visegrips, not gona happen very easily. same principle.