SQLite3を入れる

Win Ruby

http://www.sqlite.org/download.html
からDLL版を持ってきて、sqlite3.dllをc:\windows\system32\に置く

そして

C:\WINDOWS\system32>gem install sqlite3-ruby
Select which gem to install for your platform (i386-mswin32)
 1. sqlite3-ruby 1.2.1 (mswin32)
 2. sqlite3-ruby 1.2.1 (ruby)
 3. sqlite3-ruby 1.2.0 (mswin32)
 4. sqlite3-ruby 1.2.0 (ruby)
 5. Skip this gem
 6. Cancel installation
> 1
Successfully installed sqlite3-ruby-1.2.1-mswin32
Installing ri documentation for sqlite3-ruby-1.2.1-mswin32...
Installing RDoc documentation for sqlite3-ruby-1.2.1-mswin32...