(I hope I don't catch any flap for negative comments about EntreCard...)
I tried it for several months and discovered three things:
1. You need to take the time to drop your card on a lot of EC users in order to get a lot of traffic to your blog. This takes time even if you have a program to help you with this.
2. When dropping a lot of cards, there is no time to actually read the blogs where you're dropping.
3. Even if you get a lot of traffic on your blog, people are just stopping by, dropping their card, and exiting without reading the content.
I'm just not so impressed with EntreCard.
I've seen high traffic blogs with the EC widget. Once they take the EC widget away, the traffic drops way down. The number of comments on the blog, however, remain the same.
If you want a lot of traffic, join EntreCard and drop your card everywhere.
If you want a lot of quality traffic who reads and appreciates your blog, don't bother with EntreCard.
A friend of mine summed it up by saying "EntreCard is the freeway through blogland. You speed through and miss all the little towns along the way. I like to take the country roads so I can stop and enjoy the little towns I pass through. If I like a particular town, I'll probably visit again."
(And remember, all comments are do-follow, so your comment left here supports YOU.)