Well I tried Yahoo personals and Match.com and I guess I'm biased since I met my wonderful husband on match.  There are a lot of new sites now since I was on match so I can't compare with too many.  As a woman you have to weed through a lot of emails.  My husband was persistant and kept emailing me so I finally gave in and emailed him back.  We did email back and forth for a while getting to know each other before we finally decided to meet.  I did meet a lot of great people on match and it was a really fun experience.  Just make sure you always meet in a public place (of course) and be yourself...