How to nicely annotate a ggplot2 (manual)

Question

Using ggplot2 I normally use geom_text and something like position=jitter to annotate my plots.

However - for a nice plot I of

Answer 1

These days there are packages adding labeling:

1. geom_dl from the directlabel package with automatic data filtering to avoid repeated labels and
2. geom_label_repel and geom_text_repel from package ggrepel make labels that try to avoid sitting on top of the data or each other and which in the case of geom_label_repel have a boundary and a non-transparant background.