It's not that big of an issue with me, but sometimes I've seen some pretty big mistakes made in spelling here. I know that a lot of times it's typos and a good proofreading would take care of it, but I have a better way.
A while back, I was recommended Google Toolbar. It's a pretty feature-filled toolbar that has a lot of stuff for searching with Google.
However, I already have a Google search built into Firefox, and besides, I'm not here to advertise for Google. My point is that the Google toolbar has a spell checker, and it works pretty well too. I use it every time I post something, and it'll pick up anything that is not a normal word. (Unfortunately, Zelda terms are not normal words. Oh, well.) It even tells you how to use it the first time you click on the button. If you don't even want the whole toolbar, you can right-click of the "toolbar" area of your browser and configure it. (It works for Firefox. I'm not sure about IE.)
So if you want people to get off your back because of poor spelling, or even just typos, I suggest you get the Google Toolbar. Personally, I couldn't do without it. (If fact, I just used it.)
Here are the download pages:
Firefox
Microsoft Internet Explorer