On 10 Nov 2009 14:38:37 -0500, DJ Delorie wrote:

sections vertically as well as support the center section. My
original idea was just biscuits, but now I'm thinking floating tenons
would be better. Comments? Ideas? Suggestions?

How about some angle iron, maybe 3/4" in size? It could start a few
inches back so it's not noticeable.