It's been over a year since I first mentioned the gmail sidebar contact list add-on Rapportive but, for whatever reason, I'm just now getting around to actually installing it. They've done some massive changes to the latest version and it looks quite nice! Perhaps more importantly, it actually functions extremely well too. It's scary how much information it can pull up on one person based solely on their email address but it ends up being quite handy!

Thanks to Chad for the gentle nudge to try it out.