Not sure everyone caught this as was answered in the least popular of the three Reincarnation threads, but here is what Eladrin said:
With Lesser (and Greater) Reincarnation, your tomes will gradually re-apply themselves as you increase in level, at the minimum levels tomes can be applied at.
If you ate a +3 strength tome, for instance, and then lesser reincarnated, you would get a +1 inherent bonus strength at level 3, +2 at level 7, and +3 at level 11.
The thread is here:
http://forums.ddo.com/showthread.php?t=206075&page=2
Not sure it is what everyone wanted to hear (especially those that ate a +2 INT Tome at lvl 1), but it satisfies me as it would totally suck if we lost all our tomes!
Barumar