Eh. Don't use tables for the tag-cloud. :p it's called a tag-cloud because of the 'random'-ness of the text. Putting it in a table will create an ordered, block-structure. Try this code in your html body:
<p><span style="font-size: 11px">Thing 1</span> <span style="font-size: 20px">Thing 2</span> <span style="font-size: 16px">Thing 3</span> <span style="font-size: 14px">Thing 4</span> <span style="font-size: 12px">Thing 5</span> <span style="font-size: 28px">Thing 6</span> <span style="font-size: 19px">Thing 7</span> <span style="font-size: 15px">Thing 8</span></p> --- quickly
taken from this tutorial
For your 'scrolling' effects. You can choose from
a load of effects at dynamicdrive. But I suggest you choose one consistent effect only. (Or just use CSS to change the color)