azguy stole about half my responses. Take his list and add:
1) A very detailed, head-to-head comparison between performance characteristics of the same ball with the same drill only at different Abralon finishes (one of azguy's responses, just expanded a little).
2) Charting the optimum rev/speed ratio from slow to fast (i.e., if you have a 250 rev rate, your speed should be X), and how you can change your style to hit this "sweet spot."
3) A very detailed look at hybrid cover bowling balls (the solid/pearl combos) and how they differ from their solid or pearl counterparts.
4) Thumb vent holes. I say this because I fought thumb hole issues for over a decade and just recently started drilling vent holes, and it has solved my problem. I rarely see it talked about, though, and I think others could benefit from it.
5) A full spread on non-traditional layouts (i.e., Tommy Jones, Girard, 315, etc.)
Jess