I don't know if you guys realize this, but I'm making periodic updates to SDE on the download page. To see what date your version was compiled on click Help | About within the program.

If you want to help work on SDE you need my latest Common Sources (available on the download page) and Sphere Common Sources (send me an e-mail and I'll give them to you).

Don't worry, I'm going to make a big update when the new engine is released. I didn't think I was going to be able to do any programming over vacation but I realized I could boot into Linux before I leave and use my computer remotely from home. I'll work on optimizing the LZ implementation I'm using to compress maps, tilesets, spritesets, etc.