I was reading the "groundless complaints" thread, which got me thinking about when DS goes to full time school in September. He is my PFB (and has been an only, will be until May) and I'm going to try really hard not to be clingy and annoying. 
I used to work at our school as a special ed aide, so I have some idea, but being a parent is going to be a whole different ball game.
So, lovely teachers of MN, any advice on being a helpful, supportive but not annoying parent? :)