This isn't what photography is all about. Hell, if you zoom right into any famous photo chances are it will be slightly (or a lot!) blurred. Trying to achieve perfect sharpness is a distraction, and worrying about it is even worse. When you print out your photo's they'll look good, and most people look at them on the web quite small, so it really doesn't matter anyway.
However, it didn't matter how much I knew the theory, it still bothered me that my lovely new (second-hand) dSLR wasn't much better than my trusty Fujifilm S5700 / S700, so I went for an independent view and submitted a recent shot of the Spinnaker Tower to stock photography site Bigstockphoto, taken with the 350d using a manual focus m42 Pentacon 29mm lens.
The guys and gals at BigStockPhoto are trying to sell our photo's to professional users, so they check photo's for quality, and I was pleasantly surprised when the above image got accepted.
So I'm going to stop worrying about slightly blurred images, and get on with trying to take great photographs that capture the moment.