I still have to use a flash. I broke the Tamron lens by dropping the camera getting out of my car while chasing a fire, so I bought an old Sigma lens on eBay for like $90 shipped that has similar specifications. Turns out the Sigma (and the Tamron) can do manual... that's what the m/s/c switch on the camera body is for. The Nikon lens it came with just happens to also have a manual/auto switch on it in addition to the one on the camera.
If you have a lens that will go to a 2.8 f-stop or lower you're golden. Mine will only go down to like 4.5 (and when zoomed in all the way it will only go down to a 6 f-stop) so a flash is needed. In the years since that post, I've gotten better at anticipating the shot.
Here are a couple of shots from last year that are pretty typical of what I end up with at games. I didn't brighten them to post here so you can see as much of the truth as possible; for the printed page, I open it in photoshop, use curves until it looks good on the screen (now a 19" iMac from January 2007), go to shadow/highlight and up the shadow by 15 percent or so, convert to CMYK color, up brightness by 10 and contrast by 6, then save as a .tif image.