^I've been posting plenty of HQs and they haven't been resized. I'm guessing that perhaps they're resized if they're over the 1.5 MB limit? There are plenty of HQs that are smaller than that which is why I haven't had much of a problem recently I guess. As for being, jpeg-ed, most of the pics are already in jpeg format so that's not really an issue. But I've used imageshack for png files and they haven't been jpeg-ed. *shrugs*
I try to avoid using imagevenue at all costs. Aside from the porno links, I ended up with three viruses in a single week after opening three of their files

And I'm sure it was coming from them as I would open the file, my computer would slow down significantly for several minutes, and then my virus protection would alert me to the problem. I actually think whatever was causing it (I assume one of the ads) has been taken care of as it hasn't happened to me again since that one week, but I'm still annoyed about it and refuse to use them if I don't have to
another alternative I guess is
allyoucanupload. It lets you upload three at a time, and it doesn't resize.