The old addages are right, if you want your site to get more traffic - add more relevent content. A few months ago I was getting 2 visits a day on average, and 1 was usually me :). Now that I have begun writing more in my blog and released the alphas of Sky Defender, I am averaging 52 visits a day. I've only advertised the alphas on a private developer forum, but I did post a link to my blog in a public developer forum. I notice a lot of visits to the RSS feeds for my blog now, which I'm taking to mean people are interested in what I'm working on and are excited about seeing Sky Defender completed and my future games. Everytime I think about that it gives me a huge burst of inspiration and energy to work so I don't let them (you) down.
Another thing I've noticed, I picked a really bad name for a game. What do I mean by that. If you google, msn, or yahoo for Sky Defender there are millions of hits. Somehow, even with that I've managed to be #3 on msn and # 15 on yahoo. It looks like google hasn't reindexed my site for a while so I don't even show up in the top 100 there. Maybe this could actually be a good thing. If there are that many sites, then that means it is an intuitive name and hopefully a lot of people search for it. If I'm that high and I only posted on private forums, imagine where I will be when it's comleted and I issue a press release.
And finally, I posted some of my thoughts on a completely non game related topic in my personal blog over a year ago and it got a link from another site. I still get about 1 visit a week from that old link. The takeaway, no matter how seemingly insignificant a post you make is, it stays on the web forever and can drive traffic. So try to make them all interesting and useful.