Pim van Meurs has a blog post at The Panda's Thumb about the recent paper on translational selection on a synonymous polymorphic site in a eukaryotic gene (DOI link). He points out that this was predicted in a paper from 1987. In short, the rate of translation

http://www.scienceblogs.com/evolgen/2007/01/silent_mutations_continue_to...

A "silent" polymorphism in the MDR1 gene changes substrate specificity. Kimchi-Sarfaty C (2007) Science.
The efficiency of folding of some proteins is increased by controlled rates of translation in vivo. A hypothesis. Purvis IJ (1987) J Mol Biol.
January 2, 2007