First of all, I'm right handed, so I won't blame you for not taking my advice.
Secondly, I agree with Aislynn. In crochet, there's a pretty big difference between working lefty and righty, but in knitting, things are a lot more equal. I use my left hand almost as much as I do my right throughout the a knitting project, even though it's not my dominant hand. Because of this, I've never really seen knitting as being greatly affected by whether you're left or right handed. The one exception I can see is the way you hold the yarn. So if you haven't already, look into continental knitting (where you hold the yarn in your left hand). It's supposedly a faster way of knitting and creates more even stitches (not sure if that's true or not), but it's also probably easier for lefties. Knittinghelp.com has some really good vids that explain it really well. It's probably a good place to start.
I hope this helps!