One suggestion about the website : You may want to write a date next to the download link of the beta, and maybe changelog entries (or at least on some versions that you consider landmarks). This would give people a better idea that they just found something recent and active, and people who have already tested the program will easier see if they have the latest or not.
It's double-edged though, as it will be very visible if the project goes into a hiatus.

Yea, that's probably a good idea, I'll do that.

Thats really wierd. I don't have any zip files for download anywhere on the site. :S
...
Looks like it's a server configuration issue, gnuski.blogspot.com/2012/06/adobe-air-downloading-as-zip-files-on.html.
Turns out .air files are actually renamed zip files. 
I have redirected the download link to my dropbox account for the moment. Hope that fixes it.

Thanks for letting me know!

That looks like a fun game. Nice work!

Seiseki & Grimsane:
Yes, I think you are right. I definitely don't want to hold anyones work hostage, that's just dumb. There's no way for me to claim that something was made using the program so all that would achieve would be to turn off the honest people from using the program.

A basic and pro version is probably a good way to go...

(Edit: not tested, I can't use AIR. These are just my thoughts based on the screenshots)
I think that heavy tile users are going to want tools that help them detect single-use (or little-used) tiles : So maybe a usage count, and also probably a 'find' function to locate all instances of a tile. This would then lead to a 'replace' function.

While laying out existing tiles, do you plan on doing a helper for "transition" tiles (edges) ? Some time ago I made such a tool as a Lua script in Mappy, it avoided all the hassle of picking the correct edges tiles for Tranzam remake:
http://retrospec.sgn.net/screenshots.php?link=tranzam

Last, about the license: If you release a full working version 'free for personal use', aren't you afraid that nobody will buy it ?

Some good points there, thanks. Yes, I have planned indicating all instances of a tile when you mouse over it in the tile set window. Usage count and replace are good ideas too.

I do have 'auto-tiling' planned also, but I have not yet decided how that should work exactly.

About the license, I guess I will have to trust people not to use it for commercial purposes without a license. An alternative would be to make a pro version, and having for example animation support and gif export only in the pro version, I have been considering that also. I don't want to piss people off, but I still want to have enough income from it to justify continuing the development.

Wow this editor is really brilliant . Great job, especially on the tile editor.

Thanks a lot.