How many years of experience (0,5,10,15,20?)? What is the education level required (PhD vs bachelors/masters)? It's not as simple as "H1B software developer in California" nor are the salaries. They vary between companies (eg., Netflix pays more than Google)
In any case, here you go: http://h1bdata.info/ You can check what your H1B colleagues make based on their job title.
Edit: To x0x0, I'm not going to parse out data for each and every company, I have a day job you see :) I've worked for four companies (public and private), and I see that the wages are comparable to local workers (of those who chose to share their wages) and the established market rate by the state dept. of labor for the said job title. Somewhat anecdotal? Yes. It is definitely better than a blanket "H1B drives down wages".