- New CSS-based skins designed to improve the usability: there are Blue and Black themes with horizontal/vertical header (4 themes total; Black theme with horizontal header is here). Tab bar is now always vertical.
- Keyboard support: Alt-C (TOC), Alt-I (Index), Alt-S (Search); Up/Down/Left/Right, Tab, Shift-Tab; Enter (open the document). In Firefox Alt = Alt+Shift; in Safari Alt = Shift; in Opera Alt = Shift-Esc, Shift.
- Zooming (Ctrl-"+", Ctrl-"-" in most of browsers).
- Opera & Safari support. So currently it works ideally in 5 major browsers: Internet Explorer, Firefox, Chrome, Safari and Opera.
If you'll find any bug there, please describe it in comments to this post.