As a proffesional photographer specializing in commercial advertising for 15 years with a 2008 baseball son I have been shooting baseball for a while with some pretty nice equipment. I am a Nikon guy , however I believe there is little difference these days between Canon and Nikon, especially at the 1K price level. I have shot the D100, followed by a D70 and now have a D200 in my hands. The earlier models, as a used purchase is probably worth the investment, however the D200 is by far the best with a larger screen, larger chip and quicker technology. You must remember a dig camera is a computor and every shot is processed using RAM before the next image is recorded. For you outfield parents I have found that an image from my 70-200 2.8 VR lense (incrediblly sharp lense for about $1300), shot RAW(no camera processing) at 200 asa and then cropped, sharpened and enlarged with Nikon or Photoshop software gave me a better image for the price then investing $3000+ in a super telephoto.(Although I am luckey enough to have one for my business, just don't like hauling it around everywhere. Most important thing to remember is "Always shoot largest, finest Jpegs available, or RAW if possible". Invest in a few more CF cards and never shoot the small jpegs. Inevitably you will get the shot of a lifetime and it will look like **** because it was shot small amd compressed so you can't even print it. For longer lenses (300mm and up)the key points are use a monopod, shoot at the lowest ASA possible to keep yor shutter speed at least at 1/60 for fielders, at least 1/250 to stop pitchers and 1/1000 to stop batters ( I suggest aperature setting at F4-5.6) and focus set on constant. And of course with a lense like that you can shoot right threw a fence as long as you are right up on it. I use the fence and my lense shade to help stabelize my camera. I avoid night games if possible because I'm never happy with the results but if you must shoot them try this, set your camera on the highest ASA available. You will get a real grainy, saturated effect almost like old time newspaper stuff.Great stuff to convert to B&W The more you blow it up the cooler (and grainier ) it gets. But don't expect to get the same quality at night as daylight, it just won't happen.
BTW, for a real treat and if money is no problem get the D2x.......and carry about 20 gig of CF cards because you will use them.
DM
www.d2prod.comsee 'events' for baseball photography samples