Well, if we're going to do spoilers...(BSG)
Pretty much airtight argument for who is The Next Cylon. Props to cyberduck who called this like a year and a half ago, at the start of Season Two. And thanks to mistervimes for finding the site. ;-)
Icon stolen off frakufest.
http://allispain.blogspot.com/2006/05/felix-gaeta-is-absolutely-positively.html
EDIT:
Sadly, work has blocked the site so I can't give you a direct link, but go to battlestarwiki.org - they have a whole section on speculation as to who's a cylon. I haven't checked it recently so they may have come to the same conclusion recently (or not) - but it's worth a look if you haven't seen it previously.
Icon stolen off frakufest.
http://allispain.blogspot.com/2006/05/felix-gaeta-is-absolutely-positively.html
EDIT:
Sadly, work has blocked the site so I can't give you a direct link, but go to battlestarwiki.org - they have a whole section on speculation as to who's a cylon. I haven't checked it recently so they may have come to the same conclusion recently (or not) - but it's worth a look if you haven't seen it previously.