Well, I uploaded my attempt at a loot filter addon - it doesn't delete anything from your inventory, it just lets you white- or black-list items to pick up or leave behind. It hasn't been extensively tested, and doesn't have a GUI yet, just slash commands.
Anyhow, with that disclaimer, if you're interested, it's
Auto Loot Filter and I'm definitely interested in maintaining it and adding features, so let me know what you think if you try it.