I've successfully installed the tag cloud plug-in that provides smaller text. Thanks for the plug in and installation advice.
I've got one further issue...removing old tags from the tag cloud. I've been using the auto tag option, then editing the suggestions provided.
I can add new tags. On the other hand, if I go into 'edit post' and click the 'x' beside each tag I want to remove, they still remain on the page.
BTW, I'm using the following:
Atahualpa 3.4.1 (default version)