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How do I disable this, it's really annoying. Any block i look at says "Block Name(what ever block it is) - minecraft(or the mods it's from)". I'm playing direwolf20 mod pack for 1.6.4.
Probably the overlay from NEI. I pressed '0' on the numpad to disable it. You should also be able to disable it from the NEI options menu from the inventory.
It's waila (What Am I Looking At). Supposedly you can disable this via the numerical 1 (on the right of your keyboard), and the menu should be accessible via the Numerical 0 key.
Check http://www.minecraftforum.net/topic/1846244-164-waila-143/ for more info.