The following gems are installed in my native Ruby installation used for preindexing. This list
of gems is a combination of the gems I see preinstalled on OSX Leopard as well as gems
installed in Locomotive. TODO: Roll in other popular gems and versions, perhaps from InstantRails?

*** LOCAL GEMS ***

actionmailer (1.3.5, 1.3.4, 1.3.3)
    Service layer for easy email delivery and testing.

actionpack (1.13.5, 1.13.4, 1.13.3, 1.12.5)
    Web-flow and rendering framework putting the VC in MVC.

actionwebservice (1.2.5, 1.2.4, 1.2.3, 1.1.6)
    Web service support for Action Pack.

activerecord (1.15.5, 1.15.4, 1.15.3, 1.14.4)
    Implements the ActiveRecord pattern for ORM.

ActiveRecord-JDBC (0.5, 0.4, 0.3.1, 0.2.3)
    JDBC adapter for ActiveRecord, for use within JRuby on Rails.

activesupport (1.4.4, 1.4.3, 1.4.2, 1.3.1)
    Support and utility classes used by the Rails framework.

acts_as_ferret (0.4.1)
    acts_as_ferret - Ferret based full text search for any ActiveRecord
    model

BlueCloth (1.0.0)
    BlueCloth is a Ruby implementation of Markdown, a text-to-HTML
    conversion tool for web writers. Markdown allows you to write using
    an easy-to-read, easy-to-write plain text format, then convert it to
    structurally valid XHTML (or HTML).

builder (2.1.2, 2.1.1)
    Builders for MarkUp.

cached_model (1.3.1)
    An ActiveRecord abstract model that caches records in memcached

camping (1.5)
    minature rails for stay-at-home moms

capistrano (2.1.0, 2.0.0, 1.4.1)
    Capistrano is a utility and framework for executing commands in
    parallel on multiple remote machines, via SSH.

capistrano-ext (1.2.0, 1.1.0)
    Capistrano Extensions is a set of useful task libraries and methods
    that     other developers may reference in their own recipe files.

cgi_multipart_eof_fix (2.5.0, 2.3, 2.2, 2.1)
    Fix an exploitable bug in CGI multipart parsing.

daemons (1.0.8, 1.0.7, 1.0.5)
    A toolkit to create and control daemons in different ways

dnssd (0.6.0)
    DNS Service Discovery (aka Rendezvous) API for Ruby

fastthread (1.0.1, 1.0, 0.6.4.1)
    Optimized replacement for thread.rb primitives

ferret (0.11.4)
    Ruby indexing library.

gem_plugin (0.2.3, 0.2.2)
    A plugin system based on rubygems that uses dependencies only

gettext (1.10.0, 1.9.0)
    Ruby-GetText-Package is a libary and tools to localize messages.

highline (1.4.0, 1.2.9)
    HighLine is a high-level command-line IO library.

hoe (1.3.0, 1.2.0)
    Hoe is a way to write Rakefiles much easier and cleaner.

hpricot (0.6)
    a swift, liberal HTML parser with a fantastic library

io-reactor (0.05)
    An implementation of the Reactor design pattern for multiplexed
    asynchronous single-thread IO.

libxml-ruby (0.5.2.0, 0.3.8.4)
    LibXML2 bindings for Ruby

markaby (0.5)
    Markup as Ruby, write HTML in your native Ruby tongue

memcache-client (1.5.0, 1.3.0)
    A Ruby memcached client

metaid (1.0)
    slight metaprogramming helpers

mongrel (1.0.4, 1.0.1)
    A small fast HTTP library and server that runs Rails, Camping, Nitro
    and Iowa apps.

mongrel_config (0.3.1, 0.3)
    Mongrel plugin that gives you web based config tool using Camping

mongrel_status (0.2.3, 0.2.2)
    A sample plugin that reports the status of mongrel.

needle (1.3.0)
    Needle is a Dependency Injection/Inversion of Control container for
    Ruby. It supports both type-2 (setter) and type-3 (constructor)
    injection. It takes advantage of the dynamic nature of Ruby to
    provide a rich and flexible approach to injecting dependencies.

net-sftp (1.1.0)
    Net::SFTP is a pure-Ruby implementation of the SFTP client protocol.

net-ssh (1.1.2, 1.0.10)
    Net::SSH is a pure-Ruby implementation of the SSH2 client protocol.

piston (1.3.3)
    Piston is a utility that enables merge tracking of remote
    repositories.

postgres-pr (0.4.0)
    A pure Ruby interface to the PostgreSQL (>= 7.4) database

rails (1.2.5, 1.2.4, 1.2.3, 1.1.6)
    Web-application framework with template engine, control-flow layer,
    and ORM.

rake (0.7.3, 0.7.2)
    Ruby based make-like utility.

rcov (0.8.0.2)
    Code coverage analysis tool for Ruby

RedCloth (3.0.4)
    RedCloth is a module for using Textile and Markdown in Ruby. Textile
    and Markdown are text formats.  A very simple text format. Another
    stab at making readable text that can be converted to HTML.

rspec (1.0.8, 1.0.5, 0.8.2)
    RSpec-1.0.8 (r2338) - BDD for Ruby http://rspec.rubyforge.org/

ruby-debug-base (0.9.3, 0.9.2)
    Fast Ruby debugger

ruby-debug-ide (0.1.9, 0.1.8)
    IDE interface for ruby-debug.

ruby-openid (1.1.4)
    A library for consuming and serving OpenID identities.

ruby-yadis (0.3.4)
    A library for performing Yadis service discovery

rubyforge (0.4.4, 0.4.2, 0.4.1)
    A script which automates a limited set of rubyforge operations.

rubygems-update (0.9.4)
    RubyGems Update GEM

rubynode (0.1.3)
    RubyNode is a library that allows read only access to Ruby's
    internal NODE structure.

sources (0.0.1)
    This package provides download sources for remote gem installation

sqlite3-ruby (1.2.1, 1.2.0)
    SQLite3/Ruby is a module to allow Ruby scripts to interface with a
    SQLite3 database.

syntax (1.0.0)
    Syntax is Ruby library for performing simple syntax highlighting.

termios (0.9.4)
    Termios module are simple wrapper for termios(3). It can be included
    into IO-family classes and can extend IO-family objects. In
    addition, the methods can use as module function.

xml-simple (1.0.11)
    A very simple API for XML processing.

youtube (0.8.6, 0.8.5)
    A Ruby object-oriented interface to the YouTube REST API.

ZenTest (3.6.1, 3.6.0, 3.5.1)
    ZenTest provides 4 different tools and 1 library: zentest,
    unit_diff, autotest, multiruby, and Test::Rails.
