If all else fails, I rely on publication order (the same order I'd have been limited to if I were reading each new book as it was published). But I've yet been unable to quickly/easily find a series order. It's not usually a closely-guarded secret in my experience.
And if it's too involved/intricate with regard to sequels, prequels and ancillary sub-series and/or meta-series... it's not something I'm going to be interested in anyway.
