A very practical graphics package
brownstownboy gave ggplot2 v0.8.7 a score of 5/5
It took me a while to get my head wrapped around the grammar of graphics that orgnizes ggplot2, but it was well worth it. It's an extremely well thought out package. The result is very powerful. I like the fact that even simple graphs look great because the default themes and colors are carefully designed. It is generating a lot of interest and the result is that it's easy to find some great examples on the web.