[R] attention plot

[Michael Schulte]

Dear all,

I am looking for a method to draw multiple rectangles in different 
colors plus arrows between them (given a data matrix with the relevant 
coordinate and size information).

After looking around mainly on:
http://cran.r-project.org/web/views/Graphics.html
and the Rseek page
the Grid package seems one possible way to go.

Are there better suited packages for such graphs?

Thanks for a pointer
Best
Michael