So just for a minute - imagine you are some super sexy babe who has put her profile up on the internet in hopes of finding just ONE guy who is interesting, fun and CHALLENGING. Now imagine you are this hottie - opening her email to find forty responses to your profile.
The first one she reads says, "Hi! I am a SWM age 30 looking for a SWF between the ages of 22 and 29 for a possible LTR who likes hiking, long walks and dogs". DELETE! BORING!!! The next one, "Hey babe - wanna get together for some "no strings attached" fun? I promise you the night of your life!" To the trash can. And so on and so forth.
See my point here? You have GOT to do something ORIGINAL in order to get her attention. You need to come across in your email as someone DIFFERENT than the other 900 losers that emailed her and then, you have to get her OFFLINE and on the phone as quickly as possible.
And just how do you do that? Use some humor, my friend, and bust her balls a bit. Write something in your first email that would have gotten you a sound punch in the arm if she had been standing right beside you. Be daring, be a brat. Call her a dork or tell her that if she would wear green mud and cucumbers on her face at night it might help her wrinkles. Say something unexpected, and unique.
AND - another great tip for meeting women online - get different email accounts for each site that you use. Chances are - SHE is on more than one as well, so you don't want to look like you are fishing for women here. But certainly DO get into more than one online dating site.
Also, when you DO reply to her profile you need to be sure to say something about something she put on her page. Bust her balls on her hobbies or interests, or say something about her photo (no compliments!). Make sure she knows you actually READ it.
After that, you need to be sure to keep up to date on the site. If you want a woman, you need to be in the first few to respond to her. Check it every day or set up notifications for new profiles. You will have much better chances if you can get to her first before she gives up and accepts a dufus.
Remember, though, that when you DO get her attention, take it offline as quickly as possible - and understand that she may be a little freaked about meeting you. Meet her somewhere public and safe for her. Meet her at Cold Stone Creamery or for lunch somewhere. Meet her at the Mall in the food court.
Once you know HOW to do it - meeting women online can be a GREAT addition to your dating repertoire. Just use your head and remember that to get the girl, you need to get her attention first!