I use alignment languages even less than I use regular languages in D&D. In fact, I'm hard-pressed to recall I allowed any alignment language shenanigans into my game. However, if I was feeling like I needed to include them in my campaign, the only way I could make them work for me is to use alignment languages as ecclesiastical tongues. Basically, I'd set up a campaign with exactly nine gods, one of each alignment. All creatures of alignment X worship/honor/respect god Y, and worship services and other religious events are conducted in the alignment language. I've seen somewhere words to the effect that this is the scheme Gygax had in mind, but the scenario falls down if you have multiple gods. (Unless like Uncle Gary's novels alignment is a supernatural power unto itself beyond even the gods in scope. I personally don't want alignment as a ninefold manifestation of the Force.)
"Man, is there anything Jeff CAN'T do when it comes to gaming? This guy is like a critical 20 every roll. Jeff can bite the heads offa five game geeks, including their sorry-ass DM, and spit 'em into a large duffel bag ONE AT A TIME!...that's just the kind of messed up bastard he is! You think yer a gamer, punk? Well..do ya? Jeff will depants your weasel-ass right in front of your grandma."