Quote from NathanyelThis. It's also not completely unusable...
I don't know what you consider "completely unusable", but it certainly is in any realistic sense ;).
Do a search/filter for recipe or mat names and only a single result is ever shown. Making the search useless. Searching for recipes by name or material components is what made this mod unique and that's totally unusable now. Tons of errors are thrown at logon and otherwise as well, filling up !BugGrabber.
One other feature this had (I forgot about originally) that may have a decent updated replacement, though. Creation value & sell value of recipes shown in the Blizzard tradeskill frame, using Auctioneer (& other auction mod) data. The updated LilSparky'sWorkshop provides similar functionality.
So here's still hoping some author is interested enough in TradeskillInfo to update. Nothing else out there provides the in-game tradeskill recipe/mat searching & linking functionality this did.