Here’s some straight-outta-sci-fi news for ya:

Mouse stem cells used to produce eggs, Japanese scientists say

If this can be translated successfully to humans, it means a woman with no eggs – due to a hysterectomy or whatnot – could nevertheless still produce eggs. Sperm were also produced. However, both experiments used embyronic stem cells, which is of course useless here for practical use… but if it works with embryonic stem cells, it can probably be made to work with adult stem cells.