Here's an extracted native version of Last.fm for the Samsung Wave. It's from an early pre-release version of the handset.
I've had a quick go at trying to spoof install this without any luck. I tried a manual spoof using Fart Machine, and then using Wavespoofer with Warholizer. I wasn't successful in either attempt. So I'm sharing the files in the hope someone else might have more luck in getting it to work