During the course of experimenting/testing Solr, it's common to accumulate a number of output files in the source checkout. Many of these are already ignored via the .gitignore. (For example, .jar and .log files are untracked currently)
Some common output files aren't explicitly ignored by git though. I know this is true of .pid and .out files (such as those produced by running a standalone ZK).
It'd be nice if we could update the .gitignore to explicitly ignore these filetypes by default.