As easily observed in Beverly's pictures, it isn't only the downward slope of the top tube, but also the height of the head tube, angle of the seat tube, and even the length of the top tube.

Different bike lines employ different degrees of "compact geometry". Some are not that different from traditional geometry, others are very relaxed, with high head tubes and a seat tube angle that is a bit more laidback. Others offer shorter top tubes. As you peruse bike web pages and catalogs, if you see a line of bikes labeled "comfort road" bikes, then those tend to be of the most relaxed geometry.

For example Raleigh's Cadent line, which they group as their "Performance Comfort Road" line.
http://www.raleighusa.com/depts.asp?deptid=4

If you go to this page:
http://www.raleighusa.com/items.asp?deptid=4&itemid=269

Then click on the tab "Download this Catalog page" it will open a .pdf file where they describe the relaxed compact geometry features & show examples of them.