Makes you wonder if they'll do it more in the future. I wonder if 4th edition D&D (and no it won't happen for years) will have Monte's Ranger, Bard and Sorcerer variants, the best spells from Relics and Rituals, etc.
It would truly be worth the cost of a new edition to see them use the best of d20 in the official rules. Some have theorized that this was the long term plan from the beginning. If that happened, we'd probably get an SRD 2.0, which would have some weird legal ramifications. Ach, I'm giving myself a headache with logic loops....