This is my latest: Tart Black. It's a slab serif, and just about as heavy I could make it, while keeping the feel of some narrowness with it:

It still lacks some glyphs, and some shitload of kerning, but I thought it presentable for others to take a look at it.
| Attachment | Size |
|---|---|
| Tart-sample.pdf | 109.82 KB |