I came across a web site once that had amiga ADF files with games. I cant remember the site address but they even had AGA games (which even today WinUAE doesnt emulate perfectly, MacUAE doesnt at all)
What is the story is amiga software now? Have original copyright holders given up their rights and made them public domain ? are the abandonware ? whats the deal ?
Finally, if you want to run an amiga emulator go get the amiga forever package

It has ROMS, workbench disks (as files, not as disks) and the emulators. I think it cost $30-40 (lol it pays to put stuff like that on a wish list

someone gave it to me as a gift

) ... then you can go and get the Amiga In A Box package which makes the emulator and workbench environament look so cool
I am still waiting to see if a UAE is going to support AGA graphics and CD-ROM so that I can install Amiga OS 4 on it lol
Admiral