Lydia has an interesting post on negativity, and about the general backstabbing, snarkiness, and pettiness she's encountered since becoming published.
I'm sorry Lydia's had that experience. But I haven't encountered much negativity at all. Okay, there's that whole big blowup with RWA and its graphical standards, but let's face it, that's not aimed just at me. In general, though, I find other writers to be a pretty supportive bunch. Maybe I'm naive and oblivious to the dark swirling undercurrents (I tend to be oblivious to almost everything, so this isn't beyond the realm of possibility), or maybe the e-publishing community is a little different from the rest of the writing community. I find e-published authors in general, and my NCP family in particular, to be extremely helpful, kind, and uplifting. But most of the other romance authors I've encountered in my travels across the Internet have been wonderful, too. I'm sure there are exceptions, but I haven't met many.
Maybe I'm just lucky:-).