Shadowlight, I'll have to disagree here.
Well, the other classes have 3 entire books: the PHB, DMG, and MM. The XPH has to cover material from all three of those core books.
What you mentioned were races, for which no support was at the time of release available - Warforged & Shifters were both brand-new to Eberron, so they had to have support. The fact that Kalashtar have all of the XPH (released in April, Eberron released in June) means that there is tons of material for the race to use.
As for the Sharn Hardcover, I strongly disagree. A careful reading will reveal not one Psionic character, but about 6 to 8 of them. One of the most powerful individuals in the city is a Psion of 17th level! Psionics are also mentioned in relation to one of the Dragonmarked houses, and there is an entire page devoted to the district of Overlook and its Psionic population, including where one can find training and friendly faces in the district. A lot more than "one guy with a couple of levels."
Now, even with that, it's not a deluge of information, but remember that the majority of players do not use psionics, so every bit of psionic information is info they might find wasted. Proportionally to the amount of Psi-users in the gaming audience, they struck a pretty good balance I think.
I for one do not feel slighted in the least with the amount of Psionics support in Eberron. I'm sorry you do, but I can't join you in the call for "more" they've done a pretty good job thus far.
Now, what I WILL join you on is a call for a Sarlona Sourcebook! LET'S ROLL!
