Hi.
has any one used the following drawing and design products for designing   data flow diagrams (dfd), entity related diagrams (erd), etc.

1. microsoft visio 2000, 2002, 2003.
2. Poseidon For Uml By Gentle Ware.
3. Ascent by Knowledge Works.
if any one has used any of these products using jaws, give me feedback on the accessability of creating diagrams with these products.
cheers Marvin.