This is a mod for removing ID conflicts for blocks and items with mods, with extra options for detailed ID Reports and such.
ID Status Report (Tooltop over Block with Metadata)
ID Status Report (Tooltop over Item with Metadata)
It also shows what mod loaded it, if there was a mod that loaded it.
For installation, all you need to do is copy this jar to .minecraft\coremods. Forge will load and patch everything as needed automatically.