GO!GO!7188's Official site has a nice English section and is very well done. Their MySpace page has several videos to watch.Official site (in English and Japanese)
Cori's J-POP Lyrics: LyricWiki.org doesn't seem to have many lyrics for GO!GO! so I've been getting most of them from Cori's excellent site.
Rock Rabbit: The email didn't seem to work when I tried to ask for permission to post their lyrics so the site appears to be dormant. Note: the site has annoying pop up ads.
Where to buy Go!Go!'s Music