Yes you can have adsense and widget bucks on the same page. At the same time you should not take anyones advice on this and look ad adsense TOS.
I have been using widgetbucks for a week now and am happy with the results. My blogs are product specific so having visual adds about cell phones on a cell phone blog just makes sense. If you blog is not product specific you may run into ctr issues. The pay per click I am getting is double what adsense was giveing me. Again everyones results will vary and 1 week of testing is hardly an endorsment. I am happy with the program so far. I did also learn how to place the widget bucks on a forum. There might be an easier way but I cam across this article on
widgetbucksreview.com. the site has little conversation as of yet but it talks about widget bucks and I did find the info helpful.