The phangorn package is a relatively new package in R for the analysis and comparison of phylogenies. See here for the Bioinformatics paper and here for the package. Here is an example of using phangorn from getting sequences to making phylogenies and visualizing them:
Getting sequences from Genbank
Multiple alignment
Maximum likelihood tree reconstruction
Visualizing trees
Visualizing trees and traits
Make fake traits:
Visualize them on trees: