From the Salsa website: Frameset weight with uncut steerer: 51cm = 6 lbs 4 oz, 53cm = 6 lbs 5 oz, 54.5cm = 6 lbs 8 oz, 58cm = 6 lbs 14 oz

That really is not very heavy, the components you choose will play a great role in the overall weight too. Most people have a misconception that steel is heavy, but of course there are different quality tubes for both steel and aluminum that will result in a very light or very heavy frame.

Edit: Case in point - Novara uses heavier aluminum. I'm willing to bet the Salsa will be around the same, maybe lighter.