how about downloading to the computer first? any way to get it onto the droid that way? or at least, can I just copy the file onto the droid's storage and run it to install?
I'm pretty sure this is how you can access those zipped apps -- Home, Menu, Settings, Applications, check the Unknown sources box. Plug in your Droid, hope for the best after your click to install...
You should be careful when adding applications that don't come from the marketplace. Are you sure they are designed for Andorid 2.0? Would hate for you to brick your phone or cause a bunch of problems.
Market Place makes it sooo simple. It's all done on the device... no files to transfer or open. Just click, install, run. ENJOY!