I do not think our designer agree to this. Actually, we never had a deep look to the ibp admin panel, i for one only saw a screenshot once a few years back.
Few years back, it was in frames untill 2.1.x versions. I'm just not going to complain about that now, one part of this subject I will keep quiet on. Just for my sake?
Would be nice if you would report them too... maybe we should do the same and give NeoBB a tiny internal audit... more eyes see more.
I'd be happy to reprt them.

Only way you can get your hands on neoBB, is signing up for beta testing or paying for it when its released
The admin panel for phpBB3 was in development before IPB's tabbed admin panel was released. Just because they released it first, doesn't mean it's their idea. Tabbed websites have been around for years. Does IPB claim these other sites that use tabbed pages also ripped off Matt Macham?
I'm going to correct you on this. Matt mecham had it planned soon after the 2.0.x last release. No he doesn't have power over tabbed websites or he claims them. What I'm saying is, he brought up the idea of using them on a bulletin board. Next person who will do this, is vBulletin. Mind you, to me they are known for thieving ideas.