[igraph] Large Network Visualization in Igraph

[Lorenzo Isella]

Dear All,
Suppose you are given a large (about 10^5 nodes), but sparse network.
Is Igraph still a suitable tool for visualization? My question borders a 
bit the 'marketing' aspect of network science (people strive to produce 
cute visualizations).
I wonder if
(1) Igraph+eventually Cairo is able to handle this and produce vectorial 
pdf files
(2) is there any possibility of generating, if not the interactive 
visualization in igraph, at least an output file which can be fed to 
pajek, gephi (http://gephi.org/) or  cytoscape?

An example (possible with the R bindings for igraph) would help me a 
great deal.

Many thanks

Lorenzo