http://www.amazon.co.jp/exec/obidos/...p-22/ref=nosim
They are still releasing guides for the game in Japan, at least yearly. This one detailed a lot of previously unconfirmed hidden effects and latent effects on equipment, which is starting to propagate to the wikis.
That said, a printed guide is always going to be out of date after the next patch, which is now occurring at least monthly. A wiki really is the best way to keep on top of an MMO, because it's the only thing that can be maintained and edited fast enough.
http://www.playonline.com/polapps/s/...op?polg_loc=en
They do link to one of the wikis on the Community Sites page, which is linked from the front page of the official site.
In-game indicators tend to clutter up the visual display, and the previous games never had them, yet had plenty of hidden sidequests. I'd say the better time investment would be actually making the quest descriptions more useful and informative.