How do I make my table cells vertically aligned?

As posted to the mailling list by John Scully

As for Q #2, you can add the following to your StyleSheet tiddly:

.viewer td { vertical-align: bottom; }
Or
.viewer td { vertical-align: top; }

If all the cells are the same height (ie.e no wrap-around text), you
can also add the following to help show the effect:

.viewer td { vertical-align: top; height: 3em; }

Otherwise, there doesn't seem to be any other applicable tweaks,
related to vertical justification (e.g. adding a class to specific
table cells).