I am running an Motorola Droid 1.
I was able to get the download buttons back by uninstalling the updates to the Market and then download the apps I wanted before the market auto updated again.
To temporarily uninstall updates:
Settings:applications;manage applications and choose "all" at the top.
Scroll down and select Market
Choose "uninstall updates" and say "OK" or "uninstall" to any other messages that appear during the process.
When you open the Market again it will come up as the old style and you will have to agree to the terms and conditions.
You will NOT have to add your user information again.
Download the apps you want...but note that after about 15 minutes, the Market will auto update to the new style where you will not see the download button on some apps again.
Only takes about 3 minutes to complete, so it's not too bad.