This simple Ruby script will find all of the git repo's on your machine and dump all of the git history for you. Exclusions are on line 5. Your Git username is on line 13.

pull_git_history.rb

#!/usr/bin/env ruby
require 'shellwords'

puts "Finding all git repos on this machine..."
all_paths = `find ~/ -iname ".git" -not -path "*.rvm*" -not -path "*Circuits*" -not -path "*CLOUDS*" -not -path "*disorient*"`.split("\n")
# puts "Paths: #{all_paths}"

# Actually grab the history of each repo and dump it to the command line:
all_paths.each_with_index do |path,i|
  Dir.chdir(path) do
    fixed_path = Shellwords.escape(path)
    puts "History of repo at: #{fixed_path}"
    cmd = "git --no-pager log --pretty=format:\"%ad:%an:%d:%B\" --date=local --all --committer=\"James Hagerman\""
    system(cmd)
  end
  puts "=============="
end