If the affected packages are manually fetched with wget using the same URL that yum reported as broken, all the signatures check OK and "yum localinstall" upgrades the packages without complaint.
wget http://mirror.nexcess.net/CentOS/5.5/updates/i386/RPMS/device-mapper-1.0 2.39-1.el5_5.2.i386.rpm yum localinstall ./device-mapper-1.02.39-1.el5_5.2.i386.rpm
This pulls down needed dependencies and the The Magic Happens.
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