I think it looks at the database of installed rpms rather than at what's actually there so if you install it using something other than rpms, rpm won't find it. Try installing it with
rpm -ivh --nodeps tpb-0.6.1-0.rhfc1.dag.i386.rpm
if the libxsod thing is the only dependency, it should work. If it doesn't, remove the rpm again.
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