I saw this combo in a neighborhood garden...very pretty...Is the red flower Salvia 'cardinalis' and what is the blue plant below it.

I think the blue plant is an Artemisia.

The red could be salvia coccinea. The blue on may be Rue, ruta graveolens.

I think you're right on the Rue, Jay.

Thanks to you both. I enjoy this forum.

I think the blue one is the cultivar: Ruta graveolens 'Jackman's Blue'
http://www.google.com/imgres?q...

My first guess on the Salvia would be Pineapple Sage (Salvia elegans.) If you can rub the leaves they should have a fruity smell. There are several varieties of Salvia elegans that have slightly different habits and fragrances, like 'Honeydew Melon' and 'Tangerine', but the 'Pineapple' is the most common.
You are right, that is a great combo! I just love the blue-gray and red together. I'll have to see about making a similar combination here.