Hi
That all sounds very complicated.
I have sort of done it if you look at this link
there is a numeric 3 in the page title which is the category number so all i need to do now is get and display it as the category name rather than its id number.
On a slightly different note is there a setting or something that once some one clicks on a category and then clicks "view full newsletter" rather than going to the start of the category again they can click a next/previous button to view the next newsletter in that category.
At the moment they would have to click the category they want from the menu which would re-list all the newsletters in that category.