Not exactly part of ye ol' mouthnasium, but…
Fixed-position sidebar nav with hash links for the current page. For example, at the bare minimum the entries tag page would have:
- [{{ entries:listing }}](#listing)
- [{{ entries:pagination }}](#pagination)
- [{{ entries:map }}](#map)
- [{{ entries:next }}](#next)
- [{{ entries:previous }}](#previous)
- [{{ entries:meld }}](#meld)