When I'm at the gym I do push-ups, which I really feel in my abs, and I do other plank pose type things. I do regular crunches sometimes. I also am a stickler for really contracting my abs when I do weight work and, as I go heavier with weights, I find that I really feel my abs getting stronger. For obliques, I do side bends on the back extension machine.
All that said and done, I really hate working my abs. With the exception of Pilates, I never really push myself when I'm doing abs. And I don't do Pilates enough! Now you've inspired me. :)
So, as I said, I'm not much help with any plan. I just wanted to jump in and say hi.
Co-author of: MONSTER'S INK HORROR ANTHOLOGY By Cyber-Pulp Press