Kae'Yoss said:The lesser part means that it gives away its LA and instead gets another penalty. -1 to most rolls I think it is (I prefer the "monster class" approach where you only get some of your abilities until you get all the levels of your race (basically acquiring monster HD and LA)
Nope. The become humanoid (planetouched) and not outsiders. They are subject to anything that affects humanoids and outsiders.
The rules for the "lesser" races on Player's Guide to Faerun specifically state that they should be used instead of the normal races. That is there should not be lesser drow and the drow from the MM in existance at the same time.
It is a means of having a non-LA race.