I love firefox's wiggly red line text box spelling checking. It's helped my online spelling greatly. Annoying that it's so American, but I could probably change that when I have time. I use ispell in emacs when I can, but I dislike it. Emacs should have wiggly red lines too! Ispell doesn't seem to be installed on chiark, but I haven't mentioned it yet because it may well be that I just don't understand about some subtlety about how emacs is set up.