Hi
I've been doing this for a couple of months now.
check out my site:
DigitalReading Search
Welcome for the competition!
On DigitalReading Search you can easily search the entered keyword on Google book Search and MS Live Book search as well as on LibraryThing.
I'm currently working on taking it to the next level...
On the cons side... my list of ebook sites is shorter, I don't have a 125 sites in my list. I opened it up for contributors though -- from the beginning.
MobileReaders? What do you suggest? Should we join forces or compete and thereby develop new and new features?