My internet receiver got blown over yesterday and I spent so much time dealing with that, that I didn't get a tip written for today.
However, in the comments on last week's tip about the reference books, a reader asked if The Chicago Manual of Style was online. I googled. And yes, it is.
As for an online LDS Style Guide, there is THIS. It's not as complete as the printed guide and I'm not sure if you can fully trust this one, since it's a wiki and someone might have posted misinformation, but I guess it's better than nothing.