Dragon magazine used to have lists of 'useless' magic items also.
Are they just for DMs to tease the players and tell them they do have magic items? Do any players actually get excited about a pot that will keep your gruel warm, a bathrobe that will dry you off, a chair that will conform to your butt, etc. ? You inevitably get players that need to test the limits of the poorly worded nearly useless in 99.9% of situations magic items. Why would anyone create these things when you could hire a lifetime of peasants and beggars to take your trash out for you for less?
Wondrous... I think not.