Pinning glibc to squeeze is, probably, going to require downgrading few other things to squeeze, to. This or other way, doing so is replicating lenny/squeeze mix we had earlier, with all multitude of problems for future. Personally, with such perspective, I would rather opt for downgrading to Squeeze entirely, so I'm not (again, personally) interested in spending my time for pinning/mixing efforts. Of course, everyone is free to try and I'll gladly discuss results. /Estel