Hi Andy!

Since you have a 10D, the first thing you can do to greatly reduce the effects of camera shake, is to bump the ISO up to 200 or 400 when not in direct sunlight --> doubling/quadrupling the shutter speed.

Next thing to keep in mind is, this is a full 35mm format SLR (even if the sensor itself is smaller than 35mm, the geometries are all the same), and so it will exhibit very little depth of field at wide aperatures. If you've been using a smaller point and shoot digicam before, then you'll have been spoiled by the immense depth of field (aka. Depth of Focus) inherent in such designs. On the other hand, you'll probably also have been frustrated by the inability to use depth of field to isolate or emphasize a subject on occasion. No more.

Next, you'll need to practice eliminating camera shake. I use a monopod and or tripod whenever feasible, especially for landscape work, but good body posture and holding the camera correctly can combat shake a fair amount. Tuck your elbows straight down and hard into your chest when taking photographs.

My first hundred or so photos were quite blurry, even with the IS lens. But I've learned since then, and get excellent crisp photos much of the time now.

Cheers