Well, I just noticed a small button on the page for minecraft.net: the "play the demo" option. I believe this is great becuase the forum won't get an influx of "GIVE ME A REFUND OR I SUE" topics/posts. It's a small, hardly noticable button, yet it meets the suggestions of dozens of Minecrafters. Discuss this slight but excellent change!
Thanks for posting this, it must have been changed in the last week or so. Thw EXE i downloaded on 7/25 doesn't have the option but a fresh download does. Having recently had to file for disability i have to be stingy where i spend my money and this will let me be sure before i do hopefully.