Some professors are currently inactive; Arithmancy is the most obvious example. Others are certainly active - charms, divination, ancient runes, potions, flying, defence against the dark arts immediately spring to mind as having active professors (I will now wait for drivers of the professors not mentioned to remind me that they, too, are active!). We try to start a couple of classes per month at Hogwarts otherwise with 11 new threads a month it gets a bit tiring to try and keep up! That said, Potions and Defence against the Dark Arts are the most current classes, with divination being a little older but I can guarantee the professor will respond if you want him to (because I play him

)
For all classes, if there's a signup list, post your character name in there first, don't worry about waiting for it to be added to the list though, you can post in class right away. Tbh, classes aren't terribly active; we're trying a variety of ways to encourage folks to post there more, but if you've got any other ideas feel free to suggest them!
Hope that helps a bit?
[carys]~ Car
ys
Edit: Yeahh, what Samm said xD