I've previously posted about Adgitize - and many people already know about it - but I just want to say that I've been with them for just shy of 2 years and have never regretted it. You won't make huge amounts of money here, but it's a steady little earner without really having to do much for it. You also get extra traffic from views of your ad(s).
To get the most out of Adgitize, you really need to be an advertiser - it only costs $14 a month to get displayed across the whole network, and it's possible to get that back through your earnings. Plus the increased traffic - I've been getting around 50-60 visits a day from Adgitize to the 2 blogs I advertise there.
So what do you have to do to make money?
Article Points - you get points if you post on your blog(s). You do this anyway, so there's no extra work involved here.
Click Points - you get points for clicking on the Adgitize ads. I combine this with Entrecard dropping, which I do anyway. Not everyone has an EC widget, but I would say that out of the 50 Adgitize sites I visit every day, only about 5 don't have one. Why do I only visit 50 sites? Because, as an advertiser my points are doubled and I get my maximum 100 from visiting just 50 sites.
Ad Views Points - If you display Adgitize ads on your site, you get points for the number of views of those ads every day.
Page Views Points - As above, but these are points for views of pages that have the ads displayed.
Advertisers Points - This is points for being an advertiser.
So where's the extra work? The only thing 'extra' you have to do is visit some blogs, which you're doing anyway if you're in EC, and even if you aren't, how long does it take to visit 50 blogs and click on them? Especially if you're getting paid for it! I would say it takes me about 30 minutes a day - perhaps longer when I stop to read articles I'm interested in.
But even if you don't want to visit blogs and click on the ads, you're still earning points - and money - from the other categories, it's just that you're losing a potential 20% of your earnings.
You can earn as a publisher, without paying anything, but by becoming an advertiser as well, you not only can get your $14 a month back, but also make more on top of it. I've managed to be in the top 3 of the points leaderboard regularly and, as I said, I've never regretted joining - in fact I would definitely recommend it!