CEToolbox 1.7.2 is in fact the current version, several readers have told us in regard to our mention of it in TidBITS #224. [MHA] Thanks to David "wow, I'm actually correcting one of the BIG guys" Alten <email@example.com> for adding that it's available at:
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Highlight Groups in Address Book
Want to see which groups one or more contacts belong to? Select them and then press the Option key. Address Book highlights the groups of which the selected contacts are members.