The only one not reprinted that I've ever been tempted to use was the Gnome Trickster. I'm beffled as to why that hasn't been reprinted, now that I think about it ...
I don't allow anything into my game that I haven't seen and considered. If you want to play it, have a hard copy of it available in case a rules situation comes up.
That being said, I've used Dragon stuff before. Some feats, some spells. But if it's available to me, then it's available to my characters. I just make sure everyone knows well in advance.