> I also tend to leave things up on my board for a few days, after which a lot of dry erase markers become a pain to erase, whereas chalk always erases nicely.

This. If they could fix this with whiteboards, I figure they'd be a lot more popular--and no I don't need to know tricks to clean the whiteboard, indeed even deodorant spray works well enough, but it'd be nice to have a whiteboard that just wipes clean as well after a few days as it does after an hour :)

That, and the problem with pens running out. But that's a problem I feel I could have more control over if I were to use a whiteboard more often :)