Good point... if I was writing this again, I'd mention the Synergy system that ties in data sources from email, contacts, and calendar sites online into the core webOS PIM apps, giving you a unified view of everything. I didn't list it because it's a bit hard to build on, but I feel like it's the stand out feature.

Oh, and really nice multitasking. Effortless app management... but those are more user concerns.