There is a new version of the R-package bipartite available on CRAN. We (especially the package maintainer Carsten Dormann) worked hard to improve it – consistency of terminology, help files, new functions, …. Because there was some fundamental restructuring, it is now considered a new main version: 2.00 [but that doesn’t mean it has a social media interface ;-)].
So, if you are interested in ecological networks, have a look at the manual and check out new options and important changes! As Carsten says: Have a nice time plotting and analysing two-mode networks.