Sorry, we have no plans to port to Macintosh. It's partly a technology issue (would require a complete re-write in a different programming language), and partly a market size issue.
This is interesting because the technology is available, to allow us to make a port. However, being a company that is funded by sales, and not venture capital or pie-in-the-sky IPOs, we can't commit to Linux until we see evidence of people making money selling software in that market. If you hear of any - let us know! Meanwhile, we're taking a wait-and-see approach.
Palm? WinCE?, iPhone, Android? There are currently no plans - but we're potentially interested in those markets.