"Software architect" can carry a lot of meanings, so it's hard to gauge actual demand. But looked at broadly, employers in the Atlanta area, for example, not only pay a higher than average salary, but have the most job openings listed (325) in this category.
It's worth noting that a significant portion of the jobs are actually listings placed by staffing agencies filling jobs for their clients. CyberCoders, for example, is looking for a "senior voice collaboration architect" with the following specific skills: CCIE, CCDE, CCNP Voice, CCDP, MCSE, CISSP, TDM/PBX Certifications, Crestron, VoIP. Sure, that's a long list, but the base salary is "six figures," and the company offers relocation assistance if you don't already live nearby.
Nationwide listings on Dice.com: 4,775