The big addition in the upcoming TopStyle 3.5 is a "preview spy" feature which exposes an HTML tag's margins, padding and content box as you mouse over it in the preview.
Trouble is, I don't know what to call this feature. "Preview spy" isn't exactly exciting - it's bland, whereas I think this feature is pretty cool. CSSEdit for the Mac has a somewhat similar feature called "X-Ray," but I'm not wild about stealing the name from someone else's software.
Can anyone recommend a better name?
Update: OK, I've settled on the name "Box Spy" for this feature. Many thanks for all the great suggestions!