Radio Paradise for OS X version 0.5.1 (12) is available for testing. It is a quick port of the iOS app, source is available on GitHub. If you want to test it, grab it from here, unpack the zip and copy the application to the /Applications folder (not strictly needed, you can run it from everywhere).
The app is only for intel 64-bit systems and supports only OS X 10.7 or later (sorry, but I'm depending on the "new" Obj-C runtime for the app).
On the plus side it stream music from radio paradise and has HD images, song lyrics and PSD support.

Know bugs:

• Menus (the ones on top) are still completely unused.
• If you close the main window you will lose any control on the app (you can always quit it via Cmd-Q or the File menu).
• Lyrics window is sometimes a bit weird (cannot find the base reason for this).
• HD slideshow window is sometimes not completely aligned with the pictures (lacking or adding some pixel on side).
• No tunemarks support.
• UI is boring and frankly could be way better.

Help is always appreciated, on code and on graphics design/UI/usability. Just fork the code on github, and/or send me a mail or a DM.