What are our thoughts on putting all the letters after your name in a CV/resume? Pretentious? Or the only reasonable time to use all those letters?

I know there are arguments against certification, and I definitely think that using certifiction to determine whether to interview or recruit people is downright daft, because frankly learning a bunch of answers isn’t all that difficult. But I personally find that completing a certification really helps to round out my knowledge in an area. I guess my thoughts are that a fairly recent certification combined with the work experience to back it up is something that would make your CV more interesting to recruiters.