Wow yes, quite a blast from the past. I followed their early videos as inspiration for my griefing. I used their client with the various griefing functions baked in. I would do stuff like torch grief or completely reterraform the footprint of someones build I destroyed as if it was never there. Wallhacking too of course but that's just the table stakes. A lot of those functions were quickly patched on servers running bukkit at least.