theNater said:So I don't know about History, but Arcana and Religion checks can give you information about monsters, including common tactics and vulnerabilities. Knowing when you first bump into a monster that it likes to use area-affecting powers can save the party's bacon.
Nature checks can provide such information as well(about different monsters), but is wisdom based, which is why I didn't include it in the previous paragraph.
This can be somewhat useful in certain circumstances, though I suspect for 80+% of the monsters its a waste. Its an orc archer with a bow, Player I use "knowledge appropriate skill, what are its tactics." DM, "Um, well it tries to stay at range and use it bow."
But things like this can be huge so I don't totally discount them. I just don't find them generally useful as a reason to increase your int stat. If your int stat is already high sure take advantage of these skills and get a moderate benefit.