Like most people I hate pop-up ads. They get in the way of surfing and I don't like the products advertised. But one type of pop-up I like to see is comment boxes on blogs. If comments don't pop-up in a separate window then a new page loads showing one post but everything else (blogroll, links, and pictures) loads again too. It's just a minor annoyance for most, but if you read and comment on a lot of blogs it turns into a major pain. It's easy to turn on that feature in Blogger, but I'm not sure about WordPress and MovableType. All bloggers should have comments that pop-up.