MPLS as a protection mechanism

I read the thread on NANOG about MPLS in Metro Networks and the replies danced around this issue but didn't address it directly. I'd like to know if anyone is/is considering using MPLS as a Layer 1 or Layer 2 protection mechanism, whether alone or in combination with other protection mechanisms. By "protection", I am referring to resiliency similar to SONET wrapping. Would it allow the sale of different levels of protection for individual data streams? If so or if not, please contact me off-list and I'll post the compiled replies (if any). Marian Stasney Managing Partner Telecom Inquiry Solutions mstasney@telecominquiry.com Ofc: 512-295-4410 Cell: 512-845-1546