I had asked for advice here last winter on combining the ideas of hugelkultur with a raised bed and I think it was a complete success. I have a fairly small bed (5' x 13') but I did intensive planting in it and everything is just thriving and some of it is exploding. I have zero pests now (had some trouble early on with the brassicas, but that is past now) and of course used no pesticides. I have just been thrilled with the progress and outcome. On my blog I photographed and documented all the steps.
http://woolyacres.wordpress.com/2012/06/16/our-hugelkultureraised-bed-garden/
In this space I have 5 varieties of tomatoes (3 each), 2 varieties of cucumber, bush beans, broccoli and brussels sprouts, radishes and carrots. Also one each of basil, oregano, cilantro, comfrey. Plus garlic and shallots.
So thanks to all for your help!