It REALLY depends.
I'm not sure the Kindle can do a table proper at all (no idea) that is rendered dynamically. Whether it can render one that is an image... well, yes. How that looks all depends on how competent the person putting the ebook together is. Here's someone talking about it a bit:
http://www.fonerbooks.com/2008/07/fo...-business.html
Also, the new model supports monospaced fonts so perhaps something will happen there.