Oh, I'm an expert in leaving PC without people noticing it. Once or twice (or thrice?) a year I decide that I don't need PC and that PC doesn't need me, and I just leave quietly. Kind of... mean to the people I call (and used to call/should still call) my friends here, I guess... When I was a mod and felt like I needed a break and DLoA wasn't enough, I had to post a thread telling the staff why, of course. But then, I think I left rather quietly again... at least I hope I did :x
If I was to leave now, I'd have to quit all the RPs I'm in, and I'd probably tell the people I'm posting with regularly that I'd be gone... by posting in the RP discussion thread saying I'd be gone, simply ^^ Not much more. Then I'd be a ghost for a while again. Again. Again.