This list is based primarily on the List of wished enhancements for Charts.
However, I will also present a number of new features not covered in the original list.
Some other issues are detailed on the statistics wiki page, too.

Higher Priority

Histograms

This is further discussed on the stat wiki page;

covered by issue http://www.openoffice.org/issues/show_bug.cgi?id=49971
see also http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=55
bivariate histograms: http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=38

complex:

scatterplot + histogram: http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=78
back-to-back: http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=136
equal counts: http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=89
frequency polygon: http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=101

Box Plots

Box-plots (complementing stem-leaf plots and histograms) are some of the most useful and most used graphical methods in statistical data analysis. Every professional package should be able to draw box-plots.

Simple Boxplots: http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=45
- actually, boxplots are usually drawn in BW

Various Boxplot Derivations (although these are lesser priority):

Boxplot-derivatives: http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=102
Violin Plot: http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=43
Complex Charts: box-plot + whiskers + smooth polygon, http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=140

Venn Diagrams (Overlapping Data)

While there is a workaround for many current issues, there is NO method to display overlapping data in OOo;
see stat wiki page and wikipedia (http://en.wikipedia.org/wiki/Venn_diagrams)
see also http://www.openoffice.org/issues/show_bug.cgi?id=62197

Gantt Charts

see also http://en.wikipedia.org/wiki/Gantt (including the External links - Software section)
R-packages: plotrix; Gantt Project: http://ganttproject.sourceforge.net/
covered in http://www.openoffice.org/issues/show_bug.cgi?id=10704

Negative value in a percent chart

Currently in a percent chart, negative values are represented as positive values. So negative value are not correctly represented
covered in http://www.openoffice.org/issues/show_bug.cgi?id=64691

Smooth or not each curves independently

covered in http://www.openoffice.org/issues/show_bug.cgi?id=64692

Smooth area chart

covered in http://www.openoffice.org/issues/show_bug.cgi?id=64693

Pie chart with a second bar chart

In order to detail the most important sector.
covered in http://www.openoffice.org/issues/show_bug.cgi?id=64694

Pie chart with a second pie chart

In order to detail the most important sector.
covered in http://www.openoffice.org/issues/show_bug.cgi?id=64695

Combined charts

It's impossible to fix which series will be in bar and which other in line. It only depends on their order.
covered in http://www.openoffice.org/issues/show_bug.cgi?id=27363

Ballon Plot

http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=60

Surface Chart

covered in : http://qa.openoffice.org/issues/show_bug.cgi?id=29012

3D Pie Chart with different heights for different pieces

covered in : http://qa.openoffice.org/issues/show_bug.cgi?id=72638

Please Don't Do It

Pie charts with different heights have been deemed among the worst graphics representations. The extra-dimension does NOT bring any additional information and annihilates the main concept behind the pie chart.

see http://www.siggraph.org/publications/newsletter/v33n3/contributions/davis.html

   11. Features that appear meaningful should have meaning.
   [...]
   Consider the three variations on a pie chart in Figure 2, all of which attempt
   to display the same data. The towering slices in the multi-height design (Figure 2A)
   are the chart's dominant features, but in many published examples have no meaning.
   The less exotic 3D pie chart (Figure 2B) has problems of its own.

--Discoleo 23:40, 25 April 2008 (CEST)